Question

Factor: 5x^2 – 15x – 20.​

Answer 1

Answer:

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Step-by-step explanation:

5x^2 – 15x – 20.

= 5(x^2 – 3x – 4).

= 5(x^2 – 4x + x – 4).

= 5{x(x - 4) +1(x - 4)}.

= 5(x-4)(x+1).

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Answer 2

Answer:

$5x {}^{2} - 15x - 20$

By middle term split factorisation,

= $5x {}^{2} - (20 - 5)x - 20$

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

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

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

Hope it helps.