find the square of the following no without actual multiplication a) 72 b) 87 c) 49 - Maths - Squares and Square Roots

Question

find the square of the following no without actual
multiplication
a) 72
b) 87
c) 49

Manbar Singh · Accepted Answer

1
722 = 70+22         =702 + 22 + 2702         =4900 + 4 + 280         =51842
872 = 90-32         =902 + 32 - 2903         =8100 + 9 - 540         =8109 - 540         =75693
492 = 50-12          =502 + 12 - 2501          =2500 + 1 - 100          =2501 - 100          =2401

find the square of the following no. without actual multiplication. a) 72 b) 87 c) 49

find the square of the following no. without actual multiplication.

a) 72

b) 87

c) 49