exam Maths Puzzle Numerical Ability

factor completely.
512x^3-1

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exam Other Question

A polynomial x has degree 3. The coefficient of x squared is 3 less than the coefficient of x cubed. The coefficient of x is three times the coefficient of x squared. The remain Please? I need help? Thank you.

solve by graphing: x - 2y = 8
x + y = - 1

solve by substitution: 5x -3y = 13
4x - 3y = 11