650 e0.13r e0.13z + 50 6.5e-0.13r (1+50e-0.13x)² 1+ 56.5e-0.13x (1+50e-0.13r)² 100 – 650 e-0.13x e-0.13x + 50

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.