Q1 of 105 Page 280

Find the errors and correct the following mathematical sentences

(3a + 4b) (a – b) = 3a2 – 4a2

For getting in the equation


(a2 – b2 ) = (a + b)(a-b)


RHS would be


3a2 – 4b2


Then LHS would be


⇒ 3a2 – 4b2


= (3a – 4b)(3a + 4b)


The error is (a – b) instead of (3a – 4b)


3a2 – 4b2 instead of 3a2 – 4a2


Hence 3a2 – 4b2 = (3a – 4b)(3a + 4b)


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