How do you solve using the square root method #x^2 + 5 = 86#?

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Answer 1 · 2016-04-14T04:54:25

#x = +-9#

To solve #x^2+5=86#

We begin by isolating the term with #x# by subtracting #5# from both sides of the equation.

#x^2cancel(+5) cancel (-5)=86 -5#

We get

#x^2=81#

Now we square root both sides to eliminate the square of #x#

#sqrt(x^2) = sqrt81#

We get

#x = +-9#