If (x - 3) and (x + 7) are multiplied to the form of a x² + bx + c then what are the values of a, b, & c respectively?
- 1, 4, -21
- 1, 4, 21
- -1, 4, -21
- None of these
Explanation
Multiply it out:
(x - 3)(x + 7) = x(x + 7) - 3(x + 7)
= x² + 7x - 3x - 21
= x² + 4x - 21
Compare with ax² + bx + c:
a = 1
b = 4
c = -21
Last verified on 26-05-2026
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