Answer:
x = {-10, 10} (Algebraic)
Explanation:
Simplifying
4x2 = 400
Solving
4x2 = 400
Move all terms containing x to the left, all other terms to the right.
Divide each side by '4'.
x2 = 100
Simplifying
x2 = 100
Take the square root of each side:
x = {-10, 10}