(x-3)3 = (x-3)*(x-3)*(x-3)
=(x-3)*(x2-6x+9) = x3 - 9x2 + 27x - 27
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x3*x2 = x5 Same base so just add the powers
No, it's a cubic equation. A quadratic equation contains, as its term raised to the highest power, a square. Example: x2. A cubic equation contains, as its term raised to the highest power, a cube. Example: x3. A quartic equation contains, as its term raised to the highest power, a term raised to the fourth power. Example: x4. Quintic, x5. And so, on.
2x2-y2
(x + y)3 + (x - y)3 = (x3 + 3x2y + 3xy2 + y3) + (x3 - 3x2y + 3xy2 - y3) = 2x3 + 6xy2 = 2x*(x2 + 3y2)
x3 6x2-x-30