Stuck on three problems
I tried to factor these bottom 2 but, nothing is adding up. An im lost what to do now.
OK, it appears this is homework that doesn't count towards assessment. Here is a start:
Solve $\displaystyle 4u^2 - 7u - 1 = 0$ and $\displaystyle u^2 - 8u + 3 = 0$ using the quadratic formula and then use the solutions that lie between 1 and -1 to construct simple trig equations. Solve those equations.
If you need more help, please show all your work and say exactly where you're stuck.