simplify 178 × 178 - 22 × 22
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= (178 + 22) (178-22)
= 200 X 156
Ans = 31200
Using identity!
We know,
178 × 178 - 22 ×22
=178² - 22²
=(178+22)(178-22) [a²+b² = (a+b)(a-b)
= 200×156
= 31200