book Maths Puzzle Numerical Ability

Solve and graph:
y = x^2 + 4x

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book Other Question

How do I find out that 5 to the sq. root of 707 is true??? what is the input and output for y=7x+2 used as the domain are 0,1,2,3
I know that the input is 0,1,2,3.help me to solve this