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Mathematics

Grade10

Easy

Question

Factorise x² – 10xy – 11y².

(x + y) (x – 10y)
(x + 10y) (x – y)
(x + 11y) (x – y)
(x – 11y) (x + y)

The correct answer is: (x – 11y) (x + y)

Factors of -11 are -11 and 1.
And (-11) + 1 = (-10)
(x – 11y) (x + y)
= x² + xy – 11xy – 11y² = x² – 10xy – 11y²

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