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Bhavya Jain
Subject: Math
, asked on 23/5/18
How to do this question number 22 on Quadratic equations?:
22. If
$\mathrm{\alpha},\mathrm{\beta}\mathrm{and}\mathrm{\gamma}$
are the roots of the equation, x
^{3}
-x-1=0, then
$\frac{1+\mathrm{\alpha}}{1-\mathrm{\alpha}}+\frac{1+\mathrm{\beta}}{1-\mathrm{\beta}}+\frac{1+\mathrm{\gamma}}{1-\mathrm{\gamma}}$
has the value.
a. 0 b. -1 c. -7 d. 1
Answer
1
Unnati
Subject: Math
, asked on 23/5/18
Let * be the operation on set {1,2,3,4,5} defined by a*b = H.C.F. ( a & b ). Form composition table and state whether the operation is binary or not. Also, check for commutative & assosciative properties. Does identity element exist ? Justify.
Answer
1
Samiksha Jain
Subject: Math
, asked on 22/5/18
que 11
$\mathbf{11}\mathbf{.}\mathrm{Solve}\mathrm{the}\mathrm{equations}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{i}\right){\mathrm{log}}_{5}\left({\mathrm{x}}^{4}+5\right)-{\mathrm{log}}_{1/5}\left({\mathrm{x}}^{2}+25\right)=\frac{3}{2}\phantom{\rule{0ex}{0ex}}\left(\mathrm{ii}\right){\mathrm{log}}_{5}\left({\mathrm{x}}^{4}+5\right)-{\mathrm{log}}_{1/5}\left({\mathrm{x}}^{2}+25\right)=3$
Answer
1
Ekta Ray
Subject: Math
, asked on 21/5/18
solve this with proper steps
9. If f(x) =
$\sqrt{{\mathrm{log}}_{1/2}\left({x}^{2}-2x+2\right)},$
then domain of f(x) is
$A)RB)R-\left(1,2\right)C){R}^{+}D)R-(1,2)$
Answer
2
Ashish Singh
Subject: Math
, asked on 20/5/18
3x=4x-1 then x can not be equal to
1) 2log3power2
2)2/2-log 2poewer3
3)1/1-log4power3
4)2log2power3/2log2power3-1
Answer
1
Charu
Subject: Math
, asked on 19/5/18
Question 193
193.
Find the missing number from the options, if the same rule is applied in all the three figures.
(a) 21 (b) 25 (c) 27 (d) 29
Answer
2
Divya Mahesh
Subject: Math
, asked on 19/5/18
Consider functions f and g such that composite gof is defined and is one-one. Are f and g both necessarily one-one ?
Answer
1
Divya Mahesh
Subject: Math
, asked on 19/5/18
Show that if f: A to B and g: B to C are onto, then gof : A to C is also onto.
Answer
1
Divya Mahesh
Subject: Math
, asked on 19/5/18
If f: A to B and g: B to C then gof will be from A to C or fog will be from A to C ?
Answer
1
Divya Mahesh
Subject: Math
, asked on 19/5/18
What do we mean when we are saying (modulus of x) is x when x is positive and (modulus of x) is -x when x is negative ? Because regardless of x being positive or negative, we get modulus of x as x or in other words positive.
please explain.
Answer
1
Suroj Dey
Subject: Math
, asked on 18/5/18
If Z is a complex number such that: (Z^2018) = i +( 2018)^2018, then find the number of 1. Complex roots, 2. Roots lying in 2nd Quadrant and in 1st Quad
Answer
1
Raj Aryan
Subject: Math
, asked on 18/5/18
Solve this:
Answer
1
Divya Mahesh
Subject: Math
, asked on 17/5/18
Suppose R = { (b,c) }
How can this relation be transitive? There are only two elements in it. Then how ?
Answer
1
Divya Mahesh
Subject: Math
, asked on 17/5/18
How is a relation transitive when there is only one element in it ?
Answer
1
Samiksha Jain
Subject: Math
, asked on 16/5/18
if a,b,c are positive real numbers such that ab
^{2}
c
^{3}
=64 then minimum value of
1/a +2/b +3/c=? (ans is 3)
Answer
1
1
2
3
4
5
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What are you looking for?

22. If $\mathrm{\alpha},\mathrm{\beta}\mathrm{and}\mathrm{\gamma}$ are the roots of the equation, x

^{3}-x-1=0, then $\frac{1+\mathrm{\alpha}}{1-\mathrm{\alpha}}+\frac{1+\mathrm{\beta}}{1-\mathrm{\beta}}+\frac{1+\mathrm{\gamma}}{1-\mathrm{\gamma}}$ has the value.a. 0 b. -1 c. -7 d. 1

$\mathbf{11}\mathbf{.}\mathrm{Solve}\mathrm{the}\mathrm{equations}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(\mathrm{i}\right){\mathrm{log}}_{5}\left({\mathrm{x}}^{4}+5\right)-{\mathrm{log}}_{1/5}\left({\mathrm{x}}^{2}+25\right)=\frac{3}{2}\phantom{\rule{0ex}{0ex}}\left(\mathrm{ii}\right){\mathrm{log}}_{5}\left({\mathrm{x}}^{4}+5\right)-{\mathrm{log}}_{1/5}\left({\mathrm{x}}^{2}+25\right)=3$

9. If f(x) = $\sqrt{{\mathrm{log}}_{1/2}\left({x}^{2}-2x+2\right)},$ then domain of f(x) is

$A)RB)R-\left(1,2\right)C){R}^{+}D)R-(1,2)$

1) 2log3power2

2)2/2-log 2poewer3

3)1/1-log4power3

4)2log2power3/2log2power3-1

193.Find the missing number from the options, if the same rule is applied in all the three figures.(a) 21 (b) 25 (c) 27 (d) 29

please explain.

How can this relation be transitive? There are only two elements in it. Then how ?

^{2}c^{3}=64 then minimum value of1/a +2/b +3/c=? (ans is 3)