4. Solve for 2: cos (x - 1) + sin(x + 1) = 6x + 5x^2 - x^3 for -2

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

It’s either a or c as the answer.