book Maths Puzzle Numerical Ability

I need to know how to solve (5x-2)(5x+2) and to show my work too.

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book Other Question

a+b=10.6
a+c=8.5
b+c=8.1
how much are a, b, c worth?

Please help .8th grade find the vertex, focus,and directrix of the parabola given by
x^2-10x-8y+33=0