document.write( "Question 1113240: find the x intercepts of the parabola with vertex (-1,-16) and y intercept (0,-15). use equation (y-k)=a(x-h)^2 \n" ); document.write( "

Algebra.Com's Answer #728255 by Fombitz(32388) $\"\"$ $\"About$

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$\"%28y-k%29=a%28x-h%29%5E2\"$
\n" ); document.write( " $\"%28y-%28-16%29%29=a%28x-%28-1%29%29%5E2\"$
\n" ); document.write( " $\"y%2B16=a%28x%2B1%29%5E2\"$
\n" ); document.write( " $\"y=a%28x%2B1%29%5E2-16\"$
\n" ); document.write( "When $\"x=0\"$ ,
\n" ); document.write( " $\"-15=a%280%2B1%29%5E2-16\"$
\n" ); document.write( " $\"-15=a-16\"$
\n" ); document.write( " $\"a=1\"$
\n" ); document.write( "So,
\n" ); document.write( " $\"y%2B16=%28x%2B1%29%5E2\"$
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.\r
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\n" ); document.write( "So,
\n" ); document.write( " $\"0%2B16=%28x%2B1%29%5E2\"$
\n" ); document.write( " $\"%28x%2B1%29%5E2=16\"$
\n" ); document.write( " $\"x%2B1=4\"$ and $\"x%2B1=-4\"$
\n" ); document.write( " $\"x=3\"$ and $\"x=-5\"$
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.\r
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