4x*x+21=18

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Solution for 4x*x+21=18 equation:


Simplifying
4x * x + 21 = 18

Multiply x * x
4x2 + 21 = 18

Reorder the terms:
21 + 4x2 = 18

Solving
21 + 4x2 = 18

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 4x2 = 18 + -21

Combine like terms: 21 + -21 = 0
0 + 4x2 = 18 + -21
4x2 = 18 + -21

Combine like terms: 18 + -21 = -3
4x2 = -3

Divide each side by '4'.
x2 = -0.75

Simplifying
x2 = -0.75

Reorder the terms:
0.75 + x2 = -0.75 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.75 + x2 = 0.00

The solution to this equation could not be determined.

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