document.write( "Question 405109: a^2 + 10a = -21 \n" ); document.write( "

Algebra.Com's Answer #286208 by Tatiana_Stebko(1539) $\"\"$ $\"About$

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$\"a%5E2+%2B+10a+=+-21\"$
\n" ); document.write( " $\"a%5E2+%2B+10a+%2B21=0\"$
\n" ); document.write( " $\"a1\"$ , $\"2+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$
\n" ); document.write( " $\"a1\"$ , $\"2+=+%28-10+%2B-+sqrt%28+10%5E2-4%2A1%2A21%29%29%2F%282%2A1%29+\"$
\n" ); document.write( " $\"a1+=+%28-10+%2B+sqrt%2816%29%29%2F2+\"$ or $\"a2+=+%28-10+-+sqrt%2816%29%29%2F2+\"$
\n" ); document.write( " $\"a1+=+-3+\"$ or $\"a2+=+-7\"$ \n" ); document.write( "

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