36(x-3)+36(x+3)=5(x²-9)

Question

36(x-3)+36(x+3)=5(x²-9)

Answer 1

36(х-3+х+3)=5х²-45
72х=5x²-45
5x²-72x-45=0
D=72²+4*5*45=5184+900=6084    √D=78
x1=0.5(72+78)=75
x2=0.5(72-78)= - 3