Return to the original problem. PEMDAS says to multiply before adding. But could you have performed a different operation and still have gotten a correct answer? Which one? Explain. (4x2 + 8x + 15) + (x2 − x − 27) − (x + 5)(x − 7)

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.