Mathematics
Factors of 4 + 4x - x2 - x3 are :
(2 + x)(2 - x)(1 + x)
(x - 2)(1 + x)(2 + x)
(x + 2)(x - 2)(1 - x)
(2 + x)(x - 1)(2 - x)
Factorisation
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Answer
Substituting x = 2 in 4 + 4x - x2 - x3, we get :
⇒ 4 + 4x - x2 - x3
⇒ 4 + 4(2) - 22 - 23
⇒ 4 + 8 - 4 - 8
⇒ 0.
∴ (x - 2) is the factor of 4 + 4x - x2 - x3.
Dividing -x3 - x2 + 4x + 4 by (x - 2),
we get quotient = -x2 - 3x - 2.
∴ -x3 - x2 + 4x + 4 = (x - 2)(-x2 - 3x - 2)
= (x - 2)[-x2 - 2x - x - 2]
= (x - 2)[-x(x + 2) - 1(x + 2)]
= (x - 2)(x + 2)(-x - 1)
= -(x - 2)(x + 2)(x + 1)
= (2 - x)(x + 2)(x + 1)
Rearranging the terms we get,
⇒ (2 + x)(2 - x)(1 + x)
Hence, Option 1 is the correct option.
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(x + 5) is a factor of 2x3 + 5x2 - 28x - 15. Hence, factorise the expression 2x3 + 5x2 - 28x - 15 completely.