Algebrahard · Past Paper
If x^2 + x + 1 = 0, find x^3.
A1
B-1
C0
Di
✓ Correct Answer: A — 1
x^3 - 1 = (x-1)(x^2+x+1). Since x^2+x+1=0, x^3-1=0, so x^3=1.
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✓ Correct Answer: A — 1
x^3 - 1 = (x-1)(x^2+x+1). Since x^2+x+1=0, x^3-1=0, so x^3=1.
Share this question