book Maths Puzzle Numerical Ability

Write in algebraic symbols.

If one addend of x is c, what is the other addend

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book Other Question

I am having trouble getting problems into the quadratic form, for instance I don't undersatnd how to do put this problem into the right form.
(x+1)^2+2(x-2)=(x+1)(x-2) Find x if Xsquared= 2x+5