book Maths Puzzle Numerical Ability

I need help with this! Thanks so much!
apply the quadratic formula to find the roots of the given function, and then graph the function.

f(x) = x^2 - 4

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book Other Question

factorise 8 x^2+10xy Work Problems PLEASE HELP ME?? EVEN IF YOU ONLY KNOW HOW TO START THIS. CAN SOMEONE GIVE ME ANY INFORMATION???
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