SOLUTION: A picture 10 inches by 19 inches is to be mounted on a piece of matboard so that there is an even amount of mat all around the picture. How wide will the border be if the area of t
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Question 187106: A picture 10 inches by 19 inches is to be mounted on a piece of matboard so that there is an even amount of mat all around the picture. How wide will the border be if the area of the mounted picture is 400 square inches? Answer by checkley77(12569) (Show Source):
You can put this solution on YOUR website! (10+2x)(19+2x)=400
190+20x+38x+4x^2=400
4x^2+58x+190-400=0
4x^2+58x-210=0
(4x+70)(x-3)=0
x-3=0
x=3 in. is the ans. for the width of the border.
Proof:
(10+2*3)(19*283)=400
(10+6)(19+6)=400
16*25=400
400=400
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