exam Maths Puzzle Numerical Ability

Can you please help me with this? I have no idea how to work these.

(3x squared - 7x + 5)+(-2x squared + 7x - 8)


(5y squared - 3y + 4)-(3y squared - 7y + 2)

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exam Other Question

WHY IS VARIABLES USEFUL IN ALGEBRA Solve the equation:

sqrtx+4 = 3

I tried to keep this seperated because the square root is x + 4.

I am going to assume I need to make X equal the 3 leaving me with this:
X= -1
sqrt-1+4 = 3
Is this the right process?