Can someone do step by step

Which of the following expressions is equal to 2x^2+8

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?