document.write( "Question 936451: Find the x-intercepts of the parabola with vertex (4,-1) and y-intercept (0,15). \n" ); document.write( "

Algebra.Com's Answer #569913 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"y=a%28x-4%29%5E2-1\"$
\n" ); document.write( "So when $\"x=0\"$ ,
\n" ); document.write( " $\"15=a%280-4%29%5E2-1\"$
\n" ); document.write( " $\"15=a%2816%29-1\"$
\n" ); document.write( " $\"16a=16\"$
\n" ); document.write( " $\"a=1\"$
\n" ); document.write( "So,
\n" ); document.write( " $\"y=%28x-4%29%5E2-1\"$
\n" ); document.write( " $\"%28x-4%29%5E2=1\"$
\n" ); document.write( " $\"x-4=0+%2B-+1\"$
\n" ); document.write( " $\"x=4+%2B-+1\"$
\n" ); document.write( " $\"x=3\"$ and $\"x=5\"$
\n" ); document.write( " \n" ); document.write( "

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