solving quadratic equations by factoring

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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?

  • solving quadratic equations by factoring -

    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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