Physics HELP

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an object 3.00 cm high is placed 20.0cm from a convex mirror with a focal length of magnitude 8.00 cm. Find the position of the image. (Im using 1over20.00 + 1overQ = 1over-8.00) and the answer is q= -5.71cm. can someone tell how to do the math.. I suck at algebra

  • Physics HELP -

    1/20 + 1/q = -1/8
    1/q = -0.125 -0.050 = -0.175
    q = -5.714

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