n(n*1.4)=300

Solution for n(n*1.4)=300 equation:

Simplifying
n(n * 1.4) = 300

Reorder the terms for easier multiplication:
n(1.4n) = 300

Remove parenthesis around (1.4n)
n * 1.4n = 300

Reorder the terms for easier multiplication:
1.4n * n = 300

Multiply n * n
1.4n2 = 300

Solving
1.4n2 = 300

Solving for variable 'n'.

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

Divide each side by '1.4'.
n2 = 214.2857143

Simplifying
n2 = 214.2857143

Take the square root of each side:
n = {-14.638501095, 14.638501095}