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question 1 ) : factorise (x + 1)² - (y - 1)²
answer : let , (x + 1) = a ; and (y - 1) = b
so , a² - b² = (a + b)(a - b)
put the value of 'a'and'b'
(x + 1 + y - 1)(x + 1 - y + 1)
(x + y)(x - y + 2)
Question 2 ) : use factor to find the value of 312² - 308²
Answer : 312² - 308²
(312 + 308)(312 - 308)
(620)(4) = 2480
Answer:
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