Evaluate :- 1). 3xsq. - x - 4
2). 6xsq. - 3 -7x

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Solution

$(1) . 3 x^{2} - x - 4 = 3 x^{2} - 4 x + 3 x - 4 = x (3 x - 4) + 1 (3 x - 4) = (x + 1) (3 x - 4) (2) . 6 x^{2} - 7 x - 3 = 6 x^{2} - 9 x + 2 x - 3 = 3 x (2 x - 3) + 1 (2 x - 3) = (3 x + 1) (2 x - 3)$

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