document.write( "Question 278845: Can I have some help with this one please?\r
\n" ); document.write( "\n" ); document.write( "y = x2 - 2x - 15
\n" ); document.write( "I have to find all these for the equation:\r
\n" ); document.write( "\n" ); document.write( "a.The y-intercept
\n" ); document.write( "b.The x-intercepts if possible
\n" ); document.write( "c.The vertex
\n" ); document.write( "d. The line of symmetry
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Algebra.Com's Answer #202829 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
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Solved by pluggable solver: SOLVE quadratic equation with variable
Quadratic equation \"ax%5E2%2Bbx%2Bc=0\" (in our case \"1x%5E2%2B-2x%2B-15+=+0\") has the following solutons:
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\n" ); document.write( " \"x%5B12%5D+=+%28b%2B-sqrt%28+b%5E2-4ac+%29%29%2F2%5Ca\"
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\n" ); document.write( " For these solutions to exist, the discriminant \"b%5E2-4ac\" should not be a negative number.
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\n" ); document.write( " First, we need to compute the discriminant \"b%5E2-4ac\": \"b%5E2-4ac=%28-2%29%5E2-4%2A1%2A-15=64\".
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\n" ); document.write( " Discriminant d=64 is greater than zero. That means that there are two solutions: \"+x%5B12%5D+=+%28--2%2B-sqrt%28+64+%29%29%2F2%5Ca\".
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\n" ); document.write( " \"x%5B1%5D+=+%28-%28-2%29%2Bsqrt%28+64+%29%29%2F2%5C1+=+5\"
\n" ); document.write( " \"x%5B2%5D+=+%28-%28-2%29-sqrt%28+64+%29%29%2F2%5C1+=+-3\"
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\n" ); document.write( " Quadratic expression \"1x%5E2%2B-2x%2B-15\" can be factored:
\n" ); document.write( " \"1x%5E2%2B-2x%2B-15+=+1%28x-5%29%2A%28x--3%29\"
\n" ); document.write( " Again, the answer is: 5, -3.\n" ); document.write( "Here's your graph:
\n" ); document.write( "\"graph%28+500%2C+500%2C+-10%2C+10%2C+-20%2C+20%2C+1%2Ax%5E2%2B-2%2Ax%2B-15+%29\"
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