Question

como resolver x elevado a 2-20=0

Answer 1

x²- 20 = 0

x² = 20

x = +/- √20

x=+/-√2².5

x= +/- 2√5

Answer 2

x² - 20 = 0
x² = 20
x = √20
x = √4.√5
x = 2 √5

20 :2
10 :2
5   :5
1             = 2 . 2 . 5 = 4 . 5