you have to log the equations
4*7^(x+2)=9^(2x-3)4⋅7x+2=92x−3
Use either natural logs or normal logs lnln or loglog and log both sides
ln(4*7^(x+2))=ln(9^(2x-3))ln(4⋅7x+2)=ln(92x−3)
First use the log rule that states loga*b=loga+logbloga⋅b=loga+logb
ln(4)+ln(7^(x+2))=ln(9^(2x-3))ln(4)+ln(7x+2)=ln(92x−3)
Remember the log rule that states logx^4=4logxlogx4=4logx
ln(4)+(x+2)ln(7)=(2x-3)ln(9)ln(4)+(x+2)ln(7)=(2x−3)ln(9)
ln(4)+xln(7)+2ln(7)=2xln(9)-3ln(9)ln(4)+xln(7)+2ln(7)=2xln(9)−3ln(9)
Bring all the xlnxln terms to one side
xln(7)-2xln(9)=-3ln(9)-2ln(7)-ln(4)xln(7)−2xln(9)=−3ln(9)−2ln(7)−ln(4)
Factorise the x out
x(ln(7)-2ln(9))=(-3ln(9)-2ln(7)-ln(4))x(ln(7)−2ln(9))=(−3ln(9)−2ln(7)−ln(4))
x=(-3ln(9)-2ln(7)-ln(4))/(ln(7)-2ln(9))x=−3ln(9)−2ln(7)−ln(4)ln(7)−2ln(9)
Solve on the calculator using the ln button or if your calculator doesn't have it use the log base 10 button.