Hey

Please help me understand how to solve the problem below. This one question stopped me from getting a hundred on the test! Thanks

Problem:

Given the function f(x) = x^2 + 2x - 99, list the x-intercepts, if any, of the graph of f.

My attempt:

f(x) = x^2 + 2x - 99

y = x^2 + 2x - 99

0 = x^2 + 2x - 99

99 = x^2 + 2x

99 - 2x = x^2

sqrt(99 - 2x) = x

(99 - 2x) / x = x

99 - 2 = x

97 = x

x-intercept is (97, 0)

Sam