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svetoff [14.1K]
2 years ago
7

Without graphing ,find where each parabola crosses the x-axis.a) y=x^-2x-3

Mathematics
1 answer:
VMariaS [17]2 years ago
8 0
When the parabola crosses the x-axis the parabola "intersects" or touches the x-axis, and therefore is an x-intercept, and we can get those by simply setting y = 0 and getting "x".

\bf y=x^2-2x-3\implies \stackrel{y}{0}=x^2-2x-3\implies 0=(x-3)(x+1)
\\\\\\
x=
\begin{cases}
3\\
-1
\end{cases}
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