Question

${(x}^{2} - 3x) {}^{2} - 8( { x}^{2} - 3x) - 20 \: factorise$
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Answer 1

let (x²-3x) be a

a² - 8a -20

= a² - 10a + 2a -20

= a(A - 10 ) + 2(A - 10)

= (a - 10)(a + 2)

=( x² - 3x - 10)(x2 - 3x + 2)

JUST SUBSTITUTE X² - 3X

AS A IN THE EQUATIONS