Question

Draw the graph of $y=x^2-x-6$ and find zeroes. Justify the answer.

Answer 1

Clearly graph of $y=x^2-x-6$ cut the x-axis at $x=-2,3$.
$\Rightarrow x=-2,3$ are zeros of $y=x^2-x-6$.
Justification:
when $x=-2;$$y=4+2-6=0$
when $x=3;$$y=9-3-6=0$