3. The expression 2x2 + 9 means a. the sum of 2 times a number squared and 9.
b. the product of 2 times a number squared and 9.
c. the sum of 9 and the square of 2 times a number.
d. the sum of 2 and 9 times the square of a number.
e. the product of the square of 2 times a number and 9.