a rectangular picture frame measures 28cm by 32cm. the thickness of the frame is the same on all four sides. the thickness of the frame is represented by x. The are of the picture ONLY is A= 4x^2 - 120x +896. determine the thickness of the frame if it is surrounding a picture with area 525 square centimeters.

Question

anonymous · Answer

So do I plug in 525 for A and solve for x?

anonymous · Answer

in that case I get -371=4x^2 - 120x and I'm stuck again

phi · Answer

you  would write your equation -371=4x^2 - 120x
as
4x^2 -120 x +371 =0

though these are ugly numbers, you can use the quadratic formula to solve for
x

anonymous · Answer

oh so I use the quadratic formula? I don't factor out?

phi · Answer

Something this ugly?  I would use the quadratic formula.

anonymous · Answer

oh perfect, thanks so much