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How to solve this quadratic equation x^2-4x-5=0

It's a quadratic equation and the x^2 is x squared

Tamara J. | Math Tutoring - Algebra and Calculus (all levels)Math Tutoring - Algebra and Calculus (al...
4.9 4.9 (51 lesson ratings) (51)
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The goal here is to solve for the unknown variable, x, when the equation is equal to zero. Since the equation is a 2nd degree polynomial function (or a quadratic function), we first want to change it into a product of two binomials by factoring. Once we have done that, we can apply the zero product property to solve for x.

x2 - 4x - 5 = 0

(x - 5)(x + 1) = 0

x - 5 = 0                 and               x + 1 = 0

x = 5                                             x = -1

Anneliese A. | Proof-reading and writing improvement - fast, thorough, and reliableProof-reading and writing improvement - ...
5.0 5.0 (39 lesson ratings) (39)
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There are two ways you could do this: factoring and then using the zero product rule, or using the quadratic formula.