On your site where do I find the following: Use radical methon to find the zeros of the function f(x) = x^2 - 49

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This function is a difference of squares. You can find the zeroes by factoring and then determining what value of x would make that factor equal to zero.To factor x^2 - 49 use the difference of squares rule: a^2 - b^2 = (a + b)(a - b):x^2 - 49 = (x + 7)(x - 7)So when x is 7 or when x is -7, the function is 0.You can see a video on difference of squares here: http://www.brightstorm.com/d/math/s/algebra/u/factoring-2/t/difference-of-perfect-squares

diffrent squares