factorise 2x^3-13x^2+26x-15
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Let p(x) = 2x3 – 13x2 + 26x – 15 Put x = 1 in p(x), we get p(1) = 0 Hence (x – 1) is factor of p(x) On dividing p(x) with (x – 1), we get the quotient as (2x2 – 11x + 15) ∴ 2x3 – 13x2 + 26x – 15 = (x – 1)(2x2 – 11x + 15) = (x – 1)(2x2 – 6x – 5x + 15) = (x – 1)[2x(x – 3) – 5(x – 3)] = (x – 1)(x – 3)(2x – 5)
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