75 x 77
53 x 21
simplify and express in the exponential form
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Answer:
5775 & 1113 respectively.
Step-by-step explanation:
(a + b) (a - b) = a² - b²
75 × 77 = (76-1) (76+1).
= (76)² - 1²
= 5776 - 1
= 5775
53 × 21 = (37 + 16) (37 - 16)
= (37)² - (16)²
= 1369 - 256
= 1113
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