MCQ
$9x^2+12x+4= 0$ have
- AReal and Distinct roots
- BNo real roots
- CDistinct roots
- ✓Real and Equal roots
✓
Answer
Correct option: D.
Real and Equal roots
Comparing the given equation to the below equation
$a x^2+b x+c=0$
$a=9, b=12, c=4$
$D=b^2-4 a c$
$D=12^2-4 \times 9 \times 4$
$D=144-144$
$D=0$
If $b^2-4 a c=0$ then equation have equal and real roots.
$a x^2+b x+c=0$
$a=9, b=12, c=4$
$D=b^2-4 a c$
$D=12^2-4 \times 9 \times 4$
$D=144-144$
$D=0$
If $b^2-4 a c=0$ then equation have equal and real roots.
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