Question

Factorise:

x2 - 7x - 30​

Answer 1

Answer:

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Step-by-step explanation:

x2 + 7x – 30 = (x + 10) (x – 3). x2 + 7x – 30 = x2 + 10x − 3x – 30 = x (x + 10) – 3 (x + 10) = (x + 10) (x – 3). (ii) Hence, or otherwise, solve the equation x2 + 7x – 30 = 0. ⇒ x = – 10 or x = 3.