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Question
Use the formula to multiply:
(4) (x – 1) (x – 9)
(4) (x – 1) (x – 9)
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Solution
As (x + a) (x + b) = x2 + (a + b)x + ab
So, (x – 1) (x – 9) = x2 +[(–9) + (–1)]x + 9
= x2 – 10x + 9
∴ (x – 1) (x – 9) = x2 – 10x + 9
So, (x – 1) (x – 9) = x2 +[(–9) + (–1)]x + 9
= x2 – 10x + 9
∴ (x – 1) (x – 9) = x2 – 10x + 9
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