Q. 1 O4.0( 10 Votes )

Find the errors and correct the following mathematical sentences

(3a + 4b) (a – b) = 3a2 – 4a2

Answer :

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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