book Maths Puzzle Numerical Ability

Here are 3 questions that I am stuck on can you help? Thanks

Explain in your own words how to reverse FOIL when factoring a polynomial of the form ax + bx +c when a =1. Give an

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book Other Question

determine whether the given ordered pair is a solution of the system of equations.

#1

(4,2); x-y=2
x+y=6

#2

(-8,-7); x-2y=6
2x-3y=5
why square roots can have two answers or one or none?