SOLUTION: A picture frame measures 12cm by 20cm. 160cm^2 of the picture shows inside the frame. What is the width of the frame? And what is the solution? thanx

SOLUTION: A picture frame measures 12cm by 20cm. 160cm^2 of the picture shows inside the frame. What is the width of the frame? And what is the solution? thanx

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Question 106384: A picture frame measures 12cm by 20cm. 160cm^2 of the picture shows inside the frame. What is the width of the frame? And what is the solution? thanx
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
let x="width of frame" ... (12-2x)(20-2x)=160 ... 240-64x+4x^2=160

x^2-16x+20=0 ... use quadratic formula to find x ... check values, only one will work
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