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Question
The roots of the quadratic equation x2 + 9 = 0 are
Options
real and equal
not real
real and negative of each other
rational numbers
MCQ
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Solution
Not real
Explanation:
x2 + 9 = 0
x2 + 0.x + 9 = 0
a = 1, b = 0, c = 9 in standard from ax2 + bx + c = 0.
D = b2 – 4ac
= (0)2 – 4(1)(9)
= –36
As, D < 0, so roots are not real.
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