Question

Which of the following is a zero of the polynomial
x2 + x-12.
B) -3
A) 3
C) 4
D) 1​

Answer 1

Answer:

${x}^{2} + x - 12=0$

${x}^{2} + 4x - 3x - 12 = 0$

$x(x + 4) - 3(x + 4) = 0$

$(x + 4)(x - 3) = 0$

$x = - 4 \: or \: 3$

Answer is

b) 3

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Answer 2

x² + x – 12 = 0

x² + 4x – 3x – 12 = 0

x(x + 4) –3 (x + 4) = 0

(x – 3) (x + 4) = 0

x – 3 = 0 or x + 4 = 0

x = 3 or x = –4

So, the answer is A) 3