How do you use quadratic formula to solve # x^2-5=0#?

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Answer 1 · 2015-05-12T20:52:37

A quadratic equation is written in the form:
#ax^2 + bx + c = 0#

The given equation #x^2-5=0# can be rewritten as #x^2+0x-5=0#

Where:
#a=1#
#b=0#
#c=-5#

The quadratic formula can be used to find the roots of any quadratic equation.

#x= (-b+- sqrt(b^2-4ac))/(2a)#

So I encourage you to plug in the values from this equation and simplify.

The answers should be #x = +-sqrt(5)#