factorise x cube + 3x square + 3x - 7
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Answer:
x³+3x²+3x-7
Zero factor method:
Here, when we put x=1, the expression = 1³+3×1²+3×1-7 = 0
So, x-1 is a factor of the expression.
x³+3x²+3x-7 = x³-x²+4x²-4x+7x-7
= x²(x-1) +4x(x-1)+7(x-1) = (x-1)(x²+4x+7)
(Note: x²+4x+7) cannot be factorised)
Step-by-step explanation:
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