Factor completely 4x2-1

Solve the equation by completing the square. x^2+2x=17

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

22. catie is starting a babysitting business. she spent $26 to make signs to advertise. she charges an initial fee of $5 and then $3 for each hour of service. write and solve an inequality to find the number of hours she will have to babysit to make a profit. interpret the solution.!