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x^4 = x² + 2x + 1
maka x^4 + x³ - x² + 2x + 3 = (x² + 2x + 1) + (x + 1) - x² - 2x + 3
= 5
caranya kalau ngak salah ni ya
x³=x+1
x^4=x²+2x+1
x^4+x³-x²+2x+3=(x²+2x+1)+(x+1)x²-2x+3
=5