Solve the inequality
x^2 ≥ 8 – 2x
Answer:
13) D
We need to use the inequalities given in the options to solve this question.
x² ≥ 8 – 2x
Rearranging,
x² + 2x – 8 ≥ 0
Factorising (x + 2x – 8),
x² – 2x + 4x – 8
x(x – 2) + 4(x – 2)
So we have, (x – 2) (x + 4) ≥ 0
Writing them down individually,
x – 2 ≥ 0
x + 4 ≤ 0
Rearranging,
x ≥ 2
x ≤ -4
So the answer is D.