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Factoring in Algebra -- Find the prime factors of each expression.
a. x2 + 11x + 18    1. (x+2)(x+9)
b. 2x2 - 5x - 3    2. (2x+1)(x-3)
c. 9x3 - 36x    3. 9x(x+2)(x-2)
d. x4 + 2x3 - 8x2    4. x2(x+4)(x-2)
e. 3x2 - 48    5. 3(x+4)(x-4)