X(X*.3)=2400

Solution for X(X*.3)=2400 equation:

Simplifying
X(X * 0.3) = 2400

Reorder the terms for easier multiplication:
X(0.3X) = 2400

Remove parenthesis around (0.3X)
X * 0.3X = 2400

Reorder the terms for easier multiplication:
0.3X * X = 2400

Multiply X * X
0.3X2 = 2400

Solving
0.3X2 = 2400

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Divide each side by '0.3'.
X2 = 8000

Simplifying
X2 = 8000

Take the square root of each side:
X = {-89.4427191, 89.4427191}