book Maths Puzzle Numerical Ability

how do add polynomials?what steps do you have to take to find out the answer?

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book Other Question

Find the value of x in the equation
The square root of x+5=the square root of x+45? Find all real or imaginary solutions for this equation.

49^2+ 9 = 42x

I can not not figure this one out. I thought it was something like:

-49^2sqrt 49^2+3(3)=42

Any assistance would be greatly appreciated