Question

Questions 11 & 12, with an explanation - if possible!!

Answer 1

x² - 3x - 2 = 0
x = -(-3) ± √((-3)² - 4(1)(-2))
                     2(1)
x = 3 ± √(9 + 8)
              2
x = 3 ± √(17)
           2

4x² + 3x + 5
b² - 4ac
(3)² + 4(4)(5)
9 + 4(20)
9 + 80
89