How can I solve?

Solve for x (hint - use the quadratic formula)

X^2 + 2x - 35 = 0
(x + 7)(x - 5) = 0
x = -7 or x = 5

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.