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Question
Expand using the formula:
(a + 7) (a − 2)
Sum
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Solution
(a + 7) (a − 2)
= a(a − 2) + 7(a − 2)
= (a × a) − (a × 2) + (7 × a) − (7 × 2)
= a2 − 2a + 7a − 14
∴ (a + 7)(a − 2) = a2 + 5a − 14
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