exam Maths Puzzle Numerical Ability

solve each equation for x

x^2 + 4x + 4 = 7

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exam Other Question

In a complex number system, any quadratic equation has either one or two solutions. (That is the T/F question)

I believe this is false because I thought they will always have 2 solutions but can someone explain if I am wrong?
I need help factoring this:

x^2-2xy+y^2-a^2-2ab-b^2

Thanks for your help and time.