To solve for a, the square root must be eliminated. To do so, perform its opposite operation. So, square both sides of the equation.
Next, move b^2 to the other side to have a^2 only at the right side. Again, do the opposite operation. Since the operation between a^2 and b^2 is addition, then subtract both sides by b^2.
And to have a only at the right side, its exponent 2 must be removed So, take the square root of both sides of the equation. And as per square root property, a has two values, the positive and negative. So,
Note that if a represents a dimension of a figure, take only the positive expression.
Since the problem does not indicate what a represents for, then consider the two expression of a.
Hence, `a= +sqrt(c^2-b^2) ` and `a=-sqrt(c^2-b^2)` .