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R(x,y) = x^3 y^4 + xy^3 - y + 2x²+3
maka,
R(-1,t) → untuk x = -1 dan y = t
= (-1)^3 . t^4 + (-1).t^3 - t + (2(-1)²) + 3
= (-1).t^4 - 1.t^3 - t + 2.1 + 3
= -t^4 - t^3 - t + 2 + 3
= -t^4 - t^3 - t + 5
2)
V(m,n) = m²n^5 + m^3 n^4 + mn² +
mn + n-3
maka,
V(3x,t) → untuk m = 3x dan n = t
= (3x)².t^5 + (3x)^3 . t^4 + 3x.t² +
3x.t + t-3
= 9x².t^5 + 27x^3 . t^4 + 3x.t² + 3x.t +
t-3
= 9x²t^5 + 27x^3 t^4 + 3xt² + t - 3