SOMEONE, PLEASE HELP ME OUT WILL MARK BRAINLIEST What are the simplified versions of the expressions shown below??
(21,24,27, and 29 don't count)

see below

Step-by-step explanation:

19. (4x + 8x² - 8) + (x² + 7 - 4x)

=   4x + 8x² - 8 + x² + 7 - 4x

=   8x² + x² + 4x - 4x -8 + 7

20.  (7x² - 11 + 16x) + (5x - 3x² - 7)

=  7x² - 11 + 16x + 5x - 3x² - 7

22.  (4x² - 12x - 10) - (2x² + x - 3)

=   4x² - 12x - 10 - 2x² - x + 3

23.  (7x³ - 9x² - 14x) - (4x³ - 4 - x)

=  7x³ - 9x² - 14x - 4x³ + 4 + x

=  7x³ - 4x³  - 9x² - 14x + x + 4

25. (9x² + 24x - 8) - (5x² + 3x + 10)

=  9x² + 24x - 8 - 5x² - 3x - 10

26.  (5x - 12x² + 9x³) - (5x³ + 6x - 3)

=  5x - 12x² + 9x³ - 5x³ - 6x + 3

28.  (2x² - 1 + 3x³) + (5 - 13x - 11x²)

=   2x² - 1 + 3x³ + 5 - 13x - 11x²

30.  (10x - x² + 8) + (5x² + 1 - 22x)

=   10x - x² + 8 + 5x² + 1 - 22x

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.

step-by-step explanation: