Answer:
option A. x = -4/5 or x= 4/5
Explanation:
The given equation is 100x² = 64
This is a quadratic equation.
Let 100x² = 64 ------(1)
Both the side of equation (1) is perfect squares.
taking square root on both side of equation (1)
we get,
x² = 64/100
x=√64100
x = ±8/10
x = + 8/10 or x= -8/10
x = 4/5 or x = -4/5
Therefore the correct option is option A. x = -4/5 or x= 4/5