Question 75463
(30+2x)(40+2x)=1800
1200+80x+60x+4x^2=1800
4x^2+140x+1200-1800=0
4x^2+140x-600=0
x^2+35x-150=0
using the quadratic equation we get:
X=(-35+-SQRT[35^2-4*1*-150])/2*1
X=(-35+-SQRT[1225+600])/2
X=(-35+-SQRT1825)/2
X=(-35+-42.72)/2
X=(-35+42.72)/2
X=-7.72/2
X=3.86 ANSWER.
X=(-35-42.72)/2
X=-77.72/2
X=-38.86 ANSWER.