4th grade math

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R^2 + R^2 + 16R + 64 = 144
solve for R.

  • 4th grade math -

    Gee, I didn't learn any algebra until the ninth grade. What you have can be reduced to something called the quadratic equation.
    2R^2 + 16R -80 = 0
    R^2 +8R -40 = 0
    R = (1/2)[-8 +/-sqrt224]
    = 3.4833 or -11.4833
    There are no integer solutions.

    Are you sure you didn't mean to write

    R^2 + 16R + 64 = 144 ?
    That has a simpler solution that you can get by taking the square root of each side.
    (R + 8)^2 = 12^2
    R = -8 +or- 12 = -20 or +4

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