Question

X square + x- 20. Factorise these.

Answer 1

Answer:

${x}^{2} + x - 20 = 0$

${x}^{2} + 5x - 4x - 20 = 0$

$x(x + 5) - 4(x + 5) = 0$

(x+5) (x-4) = 0

x = - 5 or x = 4

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