Graph the following quadratic equations and state their nature of solutions x² - 9x + 20 = 0.

Discuss the nature of solutions of the following quadratic equations.
x² - 8x + 16 = 0

Graph the following quadratic equations and state their nature of solutions.
x² + x + 7 = 0

Graph the following quadratic equations and state their nature of solutions.
x² - 9 = 0

Graph the following quadratic equations and state their nature of solutions.
(2x - 3)(x + 2) = 0