Greetings!
Answer:
x³ + 4x² -29x + 24
Explanation:
Firstly, lets multiply everything in the second bracket by x:
x(x² + 7x - 8)
x * x² = x³
x * 7x = 7x²
-8 * x = -8x
= x³ + 7x² - 8x
Now multiply everything by -3:
-3(x² + 7x -8)
-3 * x² = -3x²
-3 * 7x = -21x
-3 * -8 = 24
-3x² -21x + 24
Put the two equations in one:
x³ + 7x² - 8x -3x² -21x + 24
x³ stays the same as it is the only one,
7x² - 3x² = 4x²
-8x + -21x = -8x - 21x = -29x
24 stays the same.
Simply put the values above together:
x³ + 4x² -29x + 24
Hope this helps!