I don't know how to go on about solving this...
IT asks Use factoring to solve the equation for the real values of the variable
y^4 - 26y^2 + 25 = 0
I know how to factor but this one is throwing me off...
We have . Notice that this is a quadratic in , thus if we let we can re-write the equation as . Now this is a fairly routine quadratic since and thus we can conclude that , . Since we can say , and therefore the four roots of the equation are , .
Hope this helps.