28x^2-61+21=0

Solution for 28x^2-61+21=0 equation:

Simplifying
28x2 + -61 + 21 = 0

Reorder the terms:
-61 + 21 + 28x2 = 0

Combine like terms: -61 + 21 = -40
-40 + 28x2 = 0

Solving
-40 + 28x2 = 0

Solving for variable 'x'.

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

Add '40' to each side of the equation.
-40 + 40 + 28x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 28x2 = 0 + 40
28x2 = 0 + 40

Combine like terms: 0 + 40 = 40
28x2 = 40

Divide each side by '28'.
x2 = 1.428571429

Simplifying
x2 = 1.428571429

Take the square root of each side:
x = {-1.19522861, 1.19522861}