book Maths Puzzle Numerical Ability

What is the square root of x^2 + 2y^2

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My question says: Remember the formula 1020 sqrt P (1-.01 sqrt P)=G. If P is the population in thousands, this formula is the amount of water in gallons per minute the city needs 4y-3(y+8)=12 can you please show how an tell how to solve