If the function f : R --- R defined by f(x) = x2 + 5x + 9 find f-1(9) - Maths - Relations and Functions

Question

If the function f : R --- R defined by f(x) = x2
+ 5x + 9 find f-1(9)

(Right answers will definitely get thumbs up (only for students) -
urgent)

Let f: N -- R de function defined as f(x) = 4x2 + 12x
+15 Show that f : N-- S, where S is the range of f is invertible
Find f-1

Rajat Sethi · Accepted Answer

1
f:R→R is defined by
f(x)=x2+5x+9y=x2+5x+9y=(x+52)2+9-254y-114=(x+52)2x=y-114-52or
f-1(y)=x-114-52f-1(9)=9-114-52=254-52=0

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If the function f : R --- R defined by f(x) = x2 + 5x + 9 find f-1(9) (Right answers will definitely get thumbs up (only for students) - urgent) Let f: N -- R de function defined as f(x) = 4x2 + 12x +15. Show that f : N-- S, where S is the range of f is invertible. Find f-1 .