Question

If 4x^2 - 100 = 0 then the roots of the equation are

Answer 1

4x^2-100=0
4x^2=100
x^2=100/4
x^2=-25
x=5 or x=-5

Answer 2

4x² - 100 = 0
+ 100 + 100
4x² = 100
4 4
x² = 25
x = +5
4(5)² - 100 = 0
4(25) - 100 = 0
100 - 100 = 0
0 = 0

4(-5)² - 100 = 0
4(25) - 100 = 0
100 - 100 = 0
0 = 0

The roots of the equation is positive or negative 5.