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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. 1, 4, -21
  2. 1, 4, 21
  3. -1, 4, -21
  4. 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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