Question 160812
(25-2x)(40-2x)=700
1,000-130x+4x^2=700
4x^2-130x+1,000-700=0
4x^2-130x+300=0
(2x-60)(2x-5)=0
2x-5=0
2x=5
x=5/2
x=2.5 in. is the sqare that is cut.
Proof:
(25-2*2.5)(40-2*2.5)=700
(25-5)(40-5)=700
20*35=700
700=700