Question

此方程解题过程（50-x)*(30+2x)=2100

Answer 1

(50-x)*(30+2x)=2100

1500+100x-30x-2x^2=2100

-2x^2+70x=600

2x^2-70x+600=0

x^2-35x+300=0

(x-15)*(x-20)=0

X1=15 X2=20