Question

factorise X square + 2 x minus 8​

Answer 1

$\huge\bold\green{Ms~Coward}$

In this technique, if we have to factorise an expression like ax² + bx + c

we need to think of 2 numbers such that:

N1 × N2 = a × c=1 × ( −8 ) = −8

and

N1 + N2 = b = −2

After trying out a few numbers we get

N1=−4

and

N2 = 2 − 4 × 2 = −8 and

2 + (−4 ) = −2

x² − 2x − 8 = x² − 4x + 2x − 8

==========> x ( x − 4 ) + 2 ( x − 4 )

==========> ( x + 2 ) ( x − 4 )

Answer 2

Answer:

Answer:(x+2) (x-4)

Answer:(x+2) (x-4)Explanation:

Answer:(x+2) (x-4)Explanation:x²-2x-8

Answer:(x+2) (x-4)Explanation:x²-2x-8x²-4x+2x-8

Answer:(x+2) (x-4)Explanation:x²-2x-8x²-4x+2x-8x(x-4)+2(x-4)

Answer:(x+2) (x-4)Explanation:x²-2x-8x²-4x+2x-8x(x-4)+2(x-4)(x+2) (x-4)