find (x+3)+(x+7)=81+x(x+4)
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given [x+3]+[x+7]=81+x[x+4]
lets solve LHS i.e.,[x+3]+[x+7]
⇒x[x+7]+3[x+7]
⇒x²+7x+3x+21
∴x²+10x+21 is the LHS equation!!
lets find RHS i.e.,,81+x[x+4]
⇒81+x²+4x
∴ x²+4x+81 is the RHS equation!!
LETS EQUATE THE BOTH LHS AND RHS
⇒x²+10x+21 =x²+4x+81
⇒x²-x²+10x-4x+21-81=0
⇒0+6x-60=0
⇒6x =60
∴x=6
hopefully !!!this helps u....
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