Find the value of c that completes the square r^2-26r+c
To complete the square for the quadratic expression r^2 - 26r + c, we need to determine the value of c.
We know that to complete the square, the coefficient of r needs to be divided by 2 and squared. In this case, the coefficient of r is -26, so we need to determine (-26/2)^2.
(-26/2)^2 = (-13)^2 = 169
Therefore, the value of c that completes the square for the expression r^2 - 26r + c is 169.