Question

if a-b = 7 , find the value of a²-b²
please tell answer step by step​

Answer 1

a-b = 7

so, a = b + 7 __(i)

Substituting eq(i) in a² - b²

then, (b+7)² - b²

b² + 49 + 14b - b²

14b + 49

7b + 7b + 49

7b + 7(b+7)

7b + 7a

so, a² - b² = 7(a+b)

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