Question

Which equation is equivalent to the square root of x^2 + 81 = x + 10 (I put a picture up with the question and answers)

Answer 1

See below

Explanation:

sqrt(x^2+81)=x+10

x^2+81=x^2+20x+100 (which is one of the options)

81=20x+100

-19=20x

x=-19/20

So there's the work done.