How do you solve the equation $2x^2=x+15$ by graphing?

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How do you solve the equation $2x^2=x+15$ by graphing?

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Answer 1 · 2017-01-17T04:45:10

$(-2.5, 0); (3, 0)$

Explanation:

Given -

$2x^2=x+15$

Have it as -

$-2x^2+x+15=0$
$y=-2x^2+x+15$

Its vertex is

$x=(-b)/(2a)=(-1)/(2 xx(-2))=1/4=0.25$

After finding the vertex take a few points on either side of it.
Calculate their corresponding $y$ values.
Plot them on a graph.
Take the coordinates where the curve cuts the x-axis.

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How do you solve the equation $2x^2=x+15$ by graphing?

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