book Maths Puzzle Numerical Ability

complete the square, and find the roots of the quadratic equation.

x^2 - 2/3x = 0

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book Other Question

Simplify: (-3a^2b^-2)^2 / (5a^3)^2

Thanks guys for your help, this is a huge help 2x2 and 3x3 Systems: answer has to be in ordered pairs, or ordered triples.

Question 1. 2(x-3y)+3(y-2)= 4(x-y)-5
3/2x - 5/6y = -1

Question 2. 2x - y + z= -4