document.write( "Question 764520: Which of the following equations is quadratic?
\n" ); document.write( "x(x2+ 1) = 0
\n" ); document.write( "5(4x+ 2) = 3
\n" ); document.write( "(x+ 3)(x+ 4) = 5
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Algebra.Com's Answer #465497 by MathLover1(20850) $\"\"$ $\"About$

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\n" ); document.write( "\n" ); document.write( " $\"x%28x%5E2%2B+1%29+=+0\"$ .....equations is not quadratic: when you multiply $\"x%28x%5E2%2B+1%29+=+0\"$ you will have $\"x%5E3%2B+x+=+0\"$ and you have the equation of degree 3\r
\n" ); document.write( "\n" ); document.write( " $\"5%284x%2B+2%29+=+3\"$ .....equations is not quadratic: when you multiply $\"5%284x%2B+2%29+=+3\"$ you will have $\"20x%2B+10+=+3\"$ and you have the equation of degree 1\r
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\n" ); document.write( "\n" ); document.write( " $\"%28x%2B+3%29%28x%2B+4%29+=+5\"$ .....equations $\"is\"$ quadratic: when you multiply $\"%28x%2B+3%29%28x%2B+4%29+=+5\"$ you will have $\"x%5E2%2B7x%2B+12+=+5\"$ and you have the equation of degree 2 \n" ); document.write( "

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