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The factors of (2x2 - x - 6)2 - (2x2 - 9x + 10) are:

(a) 8(x - 2) (2x - 1)2

(b) 16(x - 2)2 (2x - 1)

(c) 16(x - 2) (2x - 1)

(d) 16(x - 2)2 (2x - 1)2

1 Answer

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Best answer

Correct option is (b) 16(x - 2)2 (2x - 1)

(2x2 − x − 6)− (2x2 − 9x + 10)2

∵ a2 − b2 = (a + b) (a − b)

⇒ (2x2 − x − 6 + 2x2 − 9x + 10) (2x2 − x − 6 − 2x2 + 9x − 10)

⇒ (4x− 10x + 4) (8x − 16)

⇒ 2(2x2 − 5x + 2) 8(x − 2)

⇒ 2(2x2 − 4x − x + 2) 8(x − 2)

⇒ 2(2x(x − 2) − 1(x − 2)) 8(x − 2)

⇒ 16(x − 2)(2x − 1)

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