Question

(vii) (x + 2)3

= 2x (x2 - 1)​

Answer 1

Answer:

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Step-by-step explanation:

(x+2)³ = x³+2³+3x²(2)+3x(2)²

=> x³+8+6x²+12x

=> x³+6x²+12x+8

(x+2)³ = x³+6x²+12x+8

Answer 2

Answer:

$(x+2)^{3} = 2x(x^{2} -1)$

                        $(x+2)^{3} = x^{3}+6x^{2} + 12x + 8$

                        $2x(x^{2} -1) = 2x^{3} -2x$

$x^{3}+6x^{2} + 12x + 8= 2x^{3}-2x$

$6x^{2} +12x+2x+8=2x^{3} - x^{3}$

$6x^{2} +14x+8=x^{3}$

$-x^{3} +6x^{2} +14x+8=0$

$x= 7.9 (Approx.)$