document.write( "Question 273231: Is theI tried solving this problem: p^2 + 8p + 16 = 0 using the quadratic formula and got -4 for the answer. My teacher mark the problem wrong. Can you help me solve it \n" ); document.write( "

Algebra.Com's Answer #199626 by CharlesG2(834) $\"\"$ $\"About$

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p^2 + 8p + 16 = 0 using quadratic formula\r
\n" ); document.write( "\n" ); document.write( "ap^2 + bp + c^2 = 0
\n" ); document.write( " $\"p+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$
\n" ); document.write( "where a=1, b=8, c=16
\n" ); document.write( " $\"p+=+%28-8+%2B-+sqrt%28+8%5E2-4%2A1%2A16+%29%29%2F%282%2A1%29+\"$
\n" ); document.write( " $\"p+=+%28-8+%2B-+sqrt%28+64-64%29%29%2F2+\"$
\n" ); document.write( " $\"p+=+%28-8+%2B-+sqrt%280%29%29%2F2+\"$
\n" ); document.write( " $\"p+=+-8%2F2+\"$
\n" ); document.write( " $\"p+=+-4+\"$
\n" ); document.write( "(p+4)(p+4) = p^2 + 4p + 4p + 16 = p^2 + 8p + 16 (used foil)
\n" ); document.write( "The answers are -4 and -4 or just -4.\r
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