Answer:
option 3
Explanation:
4x² - 100 = 0 ( add 100 to both sides )
4x² = 100 ( divide both sides by 4 )
x² = 25 ( take square root of both sides )
x = ± = ± 5
then
x = - 5 , x = 5
3.8m questions
4.8m answers
= ± 5