3r^2+21+36=4

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Solution for 3r^2+21+36=4 equation:


Simplifying
3r2 + 21 + 36 = 4

Reorder the terms:
21 + 36 + 3r2 = 4

Combine like terms: 21 + 36 = 57
57 + 3r2 = 4

Solving
57 + 3r2 = 4

Solving for variable 'r'.

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

Add '-57' to each side of the equation.
57 + -57 + 3r2 = 4 + -57

Combine like terms: 57 + -57 = 0
0 + 3r2 = 4 + -57
3r2 = 4 + -57

Combine like terms: 4 + -57 = -53
3r2 = -53

Divide each side by '3'.
r2 = -17.66666667

Simplifying
r2 = -17.66666667

Reorder the terms:
17.66666667 + r2 = -17.66666667 + 17.66666667

Combine like terms: -17.66666667 + 17.66666667 = 0.00000000
17.66666667 + r2 = 0.00000000

The solution to this equation could not be determined.

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