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Question
Factorise:
3x2 – x – 4
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Solution
We can find two numbers such that pq = 3 × (−4) = −12 and p + q = −1
They are p = −4 and q = 3
Here, 3x2 − x − 4
= 3x2 − 4x + 3x − 4
= x (3x − 4) + 1 (3x − 4)
= (3x − 4) (x + 1)
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