book Maths Puzzle Numerical Ability

Solve for x: x cubed - 4 cubed = 2x cubed - 7 cubed

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book Other Question

If $10,000 and $4000 are invested such that $1250 is earned in one year, and if the rate of interest on the larger investment is 2% more than that of the smaller investment, find the rates of interest. Thanks so very much! I need your help!
factor the quadratic expression completely, and find the roots of the expression.

20x^2 + 13x + 2