book Maths Puzzle Numerical Ability

solve each quadratic equation written in vertex form.
2(x+3)^2-4=0

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book Other Question

I need to multiply this, cant seem to work it out. Please help me

(5√[2] + 3)(√[2] - 2√[3]) If I know the length of two sides of a triangle, how do I find the length of the third side?