Question

Factorise. X^2+x-20=0

Answer 1

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${x}^{2} + x - 20 \\ {x}^{2} + 5x - 4x - 20 \\ x(x + 5) - 4(x + 5) \\ (x + 5)(x - 4)$

Note:

The middle term 1X should be sum of 2 numbers and their product must be 20

so ,

when 5x X - 4x = 20

+ 5x - 4x = 1x

Hope this is useful....

Answer 2

Answer:

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Step-by-step explanation:

Given :

★ To factorise the eqn

${x}^{2} + x - 20$

Solution :

${x}^{2} + x - 20$

${x}^{2} + 5x - 4x - 20$

$x(x + 5) - 4(x + 5)$

$(x + 5)(x - 4)$