[1,2] is the solution set of quadratic inequality _________.
a. -ax2+3x-2>0
b. -x2+3x-2>0
c. x2+2x-3>0
d. x2-2>0
a. -ax2+3x-2>0
b. -x2+3x-2>0
c. x2+2x-3>0
d. x2-2>0
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Answer:
The solutions to quadratic inequality always give the two roots. The nature of the roots may differ and can be determined by discriminant (b2 – 4ac). Examples of quadratic inequalities are: x2 – 6x – 16 ≤ 0, 2x2 – 11x + 12 > 0, x2 + 4 > 0, x2 – 3x + 2 ≤ 0
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