How do you solve #5 - x^2 = 20#?

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Answer 1 · 2017-06-01T01:29:28

#x = -3.873#

#5-x^2 = 20#

#-x^2 = 20-5#

#-x^2 = 15#

#-x = sqrt15#

#-x = 3.873#

#color(blue)(x = -3.873#

We can now prove our answer by substituting #x# for #-3.873#

#5-x^2 = 20#

#5- -3.873^2 = 20#

#5 + 3.873^2 = 20#

#5 + 15 = 20#