Question

Multiply: (x – 4)(x + 5)

(a) x2 + 5x - 20,

(b) x2 - 4x - 20,

(c) x2 - x - 20,

(d) x2 + x - 20.​

Answer 1

Hey mate...

here's the answer...

(x – 4)(x + 5).

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

= x2 + 5x – 4x – 20.

= x2 + x - 20.

Hope it helps ❤️

Answer 2

Answer :

(x - 4)(x + 5)

⇒ x (x + 5) - 4(x + 5)

⇒ x² + 5x - 4x - 20

⇒ x² + x - 20

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