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Please, please could you be so nice and help me with step by step, I can't find right solution, Thank you so much!!!!

  • algebra -

    always set everything equal to zero. That way if you find factors, you knwo that each factor that is zero will provide a root.

    -4r^2 + 20r - 13 = 0
    use the quadratic formula to get
    r = 5/2 ± √3

    -2s^2 - 26s + 1 = 0
    s = -1/2 (13 ± 3√19)

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