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Question
Expand using the formula:
(a − 4)(a − 3)
Sum
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Solution
(a − 4) (a − 3)
= a(a − 3) − 4(a − 3)
= (a × a) − (a × 3) − (4 × a) + (4 × 3)
= a2 − 3a − 4a + 12
∴ (a − 4)(a − 3) = a2 − 7a + 12
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