Question

simplify 178 × 178 - 22 × 22

Answer 1

(a^2-b^2) = (a+b)(a-b)
                = (178 + 22) (178-22)
                = 200 X 156
         Ans = 31200

Answer 2

Hey!

$178\times178-22\times22\\=31684-484\\=\boxed{\boxed{31200}}$

Using identity!

We know,
178 × 178 - 22 ×22
=178² - 22²
=(178+22)(178-22)    [a²+b² = (a+b)(a-b)
= 200×156
= 31200