document.write( "Question 1356: solve by using the Quadratic Formula: x^2+11x+18=0 \n" ); document.write( "

Algebra.Com's Answer #404 by usyim88hk(158) $\"\"$ $\"About$

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First lets look at the quadratic formula:
\n" ); document.write( " $\"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$
\n" ); document.write( "So we get the a, b, and c from the standard form of a parabola equation
\n" ); document.write( "ax^2+bx+c
\n" ); document.write( "in this case, a=1, b=11, and c=18
\n" ); document.write( "Now we can use the quadratic formula:
\n" ); document.write( " $\"x+=+%28%28-11+%2B-+sqrt%28+11%5E2+-+4%281%29%2818%29%29%29%2F%282%281%29%29%29\"$
\n" ); document.write( " $\"x+=+%28%28-11+%2B-+sqrt%2849%29%29%2F2%29\"$
\n" ); document.write( " $\"x+=+%28-11+%2B-7%29%2F2\"$
\n" ); document.write( "x = -4/2 or -18/2
\n" ); document.write( "x = -2 or -9 \n" ); document.write( "

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