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OpenStudy (anonymous):
1. A picture frame measures 12 cm by 18 cm, and 160 cm2 of picture shows. Find the width of the frame. (12-2X)(18-2X)=160 (-2X+12)(-2X+18)=160 4X^2-36X-24X+216= 160 -160= -160 4X^2-60X+156=0 4(X^2-15+39) =0 4(X- )(X- ) =0 Can anyone help me factor the rest?
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