The movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer. Factor out the GCF of the three terms, then complete the factorization of 3x³ + 9x² - 30x
a. 3x(x-2)(x + 5)
b. 3x(x + 2)(x - 5)
c. 3x²(x + 3)- 30x
d. 3x(x² + 3x - 10)