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OpenStudy (anonymous):
√(9X+81)=x+5
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OpenStudy (anonymous):
square bothside u get 9x+81 =(x+5)(x+5) \[9x+81=x^2+10x+25\] \[x^2+10x-9x+25-81=0\]
OpenStudy (anonymous):
\[x^2+x-56=0\]
OpenStudy (anonymous):
\[(x+8)(x-7)=0\]
OpenStudy (anonymous):
x=7 or x= -8
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