document.write( "Question 404705: can someone help me solve this hard problem please! Thank you! =)
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Algebra.Com's Answer #285993 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!


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document.write( "Hi
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document.write( "solving:
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document.write( "Z^4+8z^3-9z^2=0
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document.write( "z^2(z^2 + 8z - 9)= 0
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document.write( "z^2= 0   z= 0
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document.write( "(z^2 + 8z - 9)= 0
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document.write( "factoring
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document.write( "(z+9)(z-1)= 0 Note:SUM of the inner product(9z) and the outer product(-z) = 8z
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document.write( "(z+9)=0   z = -9
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document.write( "(z-1)= 0  z = 1\r
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