Question 346436
Area of rectangle = L*W
30=(3x+1)*x
30=3x^2+x
3x^2+x-30=0
3x^2+10x-9x-90=0
3x(x+10)-9(x+10)=0
(x+10)(3x-9)=0
3(x+10)(x-3)=0
x=3