How do you solve #x^2 - 20 = 0#?

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Answer 1 · 2018-06-20T06:59:04

#x^2=20#

square root both sides

#x=\pmsqrt20#

#x=2sqrt5 or x=-2sqrt5#

Answer 2 · 2018-06-20T08:32:38

#x = +-sqrt(20)#

Initial equation

#x^2-20=0#

Add #20# on both sides

#x^2=20#

Add a square root to both sides

#sqrt(x^2) = +-sqrt(20)#

Simplify

#x = +-sqrt(20)#

Hope that makes sense!