Simplify. (x3 + 2x − 3)(x4 − 3x2 + x) (please provide a step-by-step explanation and answer. I don't just need the answer I need to understand how to do this)

x12 − 3x6 − x4 + x3 + 3x2 − x
x12 − 3x6 − x4 + x3 − 15x2 − x
x7 − x5 − 2x4 − 6x3 + 11x2 − 3x
x7 − 5x5 − 2x4 − 6x3 + 11x2 − 3x

Which expression is equivalent to the expression below? (6c^2 + 3c) / (-4c + 2) / (2c + 1) / (4c - 1)a. 3c(2c-1) / (2c + 1)b. -3c(2c-1)^2 / (2c + 1)^2c. 3cd. -3c(just took the test its d. -3c)

Which of the following equations is of the parabola whose vertex is at (4, 3), axis of symmetry parallel to the y-axis and focus at (4, -3)? a.) y+3=1/24 (x+4)^2 b.)y-3=-1/24 (x-4)^2 c.)x-4=-1/24 (y-3)^2

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books