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  • Using a^2 - b^2 = (a-b)(a+b), find 12.1^2 - 7.9^2

Q : 7         Using  a^2-b^2=(a+b )(a-b), find 

                  (iv) 12.1^2-7.9^2

Answers (1)

best_answer

We know,

a^2-b^2=(a+b)(a-b)

Using this formula,

(1.02)^2-(0.98)^2 = (1.02 + 0.98)(1.02 - 0.98)

= (2.00)(0.04)

= 0.08

Posted by

HARSH KANKARIA

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