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Question
If (x + 5) and (x – 3) are the factors of ax2 + bx + c, then values of a, b and c are
Options
1, 2, 3
1, 2, 15
1, 2, −15
1, −2, 15
MCQ
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Solution
1, 2, −15
Explanation;
Hint:
(x + 5)(x – 3) = x2 + (5 – 3)x + (5)(−3)
= x2 + 2x – 15
compare with ax2 + bx + c
a = 1, b = 2 and c = −15
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