MCQ
The zeroes of a polynomial $x^2-7 x+12$ are :
- AOne positive and one negative.
- BBoth equal.
- ✓Both positive.
- DBoth negative.
✓
Answer
Correct option: C.
Both positive.
$x^2-7 x+12$
$=x^2-4 x-3 x+12=0$
$=x(x-4)-3(x-4)=0$
$=(x-4)(x-3)=0$
$\therefore x-4=0 $ or $ x-3=0$
$\Rightarrow x=4$ or $ x=3$
$=x^2-4 x-3 x+12=0$
$=x(x-4)-3(x-4)=0$
$=(x-4)(x-3)=0$
$\therefore x-4=0 $ or $ x-3=0$
$\Rightarrow x=4$ or $ x=3$
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