document.write( "Question 936967: Find the x-intercepts of the parabola with vertex (-3,16) and y-intercept (0,-20).
\n" ); document.write( "Write your answer in this form: (x1,y1),(x2,y2). \n" ); document.write( "

Algebra.Com's Answer #570404 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"y=a%28x-%28-3%29%29%5E2%2B16\"$
\n" ); document.write( " $\"y=a%28x%2B3%29%5E2%2B16\"$
\n" ); document.write( "When $\"x=0\"$ ,
\n" ); document.write( " $\"y=a%280%2B3%29%5E2%2B16=-20\"$
\n" ); document.write( " $\"9a%2B16=-20\"$
\n" ); document.write( " $\"9a=-36\"$
\n" ); document.write( " $\"a=-4\"$
\n" ); document.write( "So then,
\n" ); document.write( " $\"y=-4%28x%2B3%29%5E2%2B16\"$
\n" ); document.write( " $\"0=-4%28x%2B3%29%5E2%2B16\"$
\n" ); document.write( " $\"4%28x%2B3%29%5E2=16\"$
\n" ); document.write( " $\"%28x%2B3%29%5E2=4\"$
\n" ); document.write( " $\"x%2B3=+0+%2B-+2\"$
\n" ); document.write( " $\"x=-3+%2B-+2\"$
\n" ); document.write( " $\"x=-1\"$ and $\"x=-5\"$
\n" ); document.write( "Now use the x values to generate y values in $\"y=-4%28x%2B3%29%5E2%2B16\"$ and your answer is complete.
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