Question 171582
Can you please show me how to solve this equation using the quadratic formula 
(x-5)(x+1) = 4
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get it into quadratic form.  Multiply the binomials.
x^2 - 4x - 5 = 4
x^2 - 4x - 9 = 0 (quadratic form)
*[invoke solve_quadratic_equation 1,-4,-9]

It's 2 + sqrt(13)
and  2 - sqrt(13)