Instead of doing it for you, I'll do one exactly like it so you can do yours by using it as a model to go by following through the same steps: Find all real values of t that satisfy the equation (t^2 - 12)^2 = 140 + 6t^2So there are 4 solutions, for the 4 possible combinations of signs (1) (2) (3) (4) Now do yours the exact same way. Your answer will also have similar answers, with a square root inside a square root. Edwin