book Maths Puzzle Numerical Ability

f(x)=3/5 +7

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book Other Question

This is called a Literal Equation.
Solve (x+7)(y+4)=5 for x in the form x=ay+b/y+c
Need help understand these.

2) Is ( square root of x)^2=x an identity (true for all nonnegative values of x)?
Answer:
Explain your answer in this space.