2x^2 +60x +900=x^2 +120x +3600 solve by factorization
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2x^2-x^2+60x-120x+900-3600=0
=》x^2-60x-2700=0
=》x^2-90x+30x-2700=0
=》x (x-90)+30 (x-90)=0
=》(x-90)(x+30)=0
=》x-90=0 or x+30=0
x=90 or x=-30 (impossible)
hen x=90
=》x^2-60x-2700=0
=》x^2-90x+30x-2700=0
=》x (x-90)+30 (x-90)=0
=》(x-90)(x+30)=0
=》x-90=0 or x+30=0
x=90 or x=-30 (impossible)
hen x=90
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