Question

Multiply: (x – 4)(x + 5)

(a) x2 + 5x - 20,

(b) x2 - 4x - 20,

(c) x2 - x - 20,

(d) x2 + x - 20.
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Answer 1

Answer:

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Answer 2

Correct question :

• Multiply: (x – 4) (x + 5)

Given option :

• (a) x² + 5x - 20,

• (b) x² - 4x - 20,

• (c) x² - x - 20,

• (d) x² + x - 20.

Answer :

• We want to multiply a binomial by binomial so note this :

• $:\implies\sf{(x - 4)(x + 5)}$

• $: \implies \sf{x(x + 5) - 4(x + 5)}$

• $: \implies \sf{ {x}^{2} + 5x - 4x - 20}$

• $: \implies \boxed{ \sf{ {x}^{2} +x - 20}}$

Correct option :

$\sf{\therefore \sf{(d) \: x² + x - 20.} \: is \: the \:answer.}$