solving quadratic equations by factoring
posted by math1 .
Sheila has a picture frame that measures 20 cm by 30 cm. If she puts a mat inside the frame that decrease the picture by 264cm^2, how wide is the mat?

A1 = L*W =20 * 30 = 600cm^2.
Am = 264cm^2 = Area of mat.
Am = 20W = 264,
20W = 264,
W = 264 / 20 = 13.2cm.
OR
30W = 264,
W = 264 / 30 = 8.8CM.
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