J*J-121=0

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Solution for J*J-121=0 equation: 


Simplifying
J * J + -121 = 0

Multiply J * J
J2 + -121 = 0

Reorder the terms:
-121 + J2 = 0

Solving
-121 + J2 = 0

Solving for variable 'J'.

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

Add '121' to each side of the equation.
-121 + 121 + J2 = 0 + 121

Combine like terms: -121 + 121 = 0
0 + J2 = 0 + 121
J2 = 0 + 121

Combine like terms: 0 + 121 = 121
J2 = 121

Simplifying
J2 = 121

Take the square root of each side:
J = {-11, 11}

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