Mathematics
Use direct method to evaluate the following product:
(b - 3) (b - 5)
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Answer
(b - 3) (b - 5)
Using the formula,
(x + a)(x + b) = x2 - (a + b)x + ab
= b2 - (3 + 5)b + 3 5
= b2 - 8b + 15
Hence, (b - 3) (b - 5) = b2 - 8b + 15
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