Question

(a-b)2=a2-2ab+b2 where a=9 and b=4​

Answer 1

Answer:

(a - b )² = a² - 2ab + b²

( 9 - 4 )² = 9² - 2 × 9 × 4 + 4²

$\implies$ 81 - 72 + 16

$\implies$ 9 + 16

$\implies$ $\boxed{\sf{25}}$

Answer 2

Answer:

9^2-2*9*4+4^2

81-72+16

97-72

25