a) x² - 5x + 4 = 0
∆ = b² - 4 .a.c
∆ = (-5)² - 4. 1 . 4
∆ = 25 - 16
∆ = 9
∆ = b² - 4 .a.c
∆ = 1² - 4.1. (-6)
∆ = 1 + 24
∆ = 25
c) x² + 2x - 8 = 0
∆ = b² - 4 .a.c
∆ = 2² - 4.1.( -8)
∆ = 4 + 32
∆ = 36
d) x² - 6x + 9 = 0
∆ = b² - 4 .a.c
∆ = ( -6)² - 4.1.9
∆ = 36 - 36
∆ = 0
e) x² + 4x + 4 = 0
∆ = b² - 4 .a.c
∆ = 4² - 4.1.4
∆ = 16 - 16
∆ = 0
f) x² + 2x + 4 = 0
∆ = b² - 4 .a.c
∆ = 2² - 4.1.4
∆ = 4 - 20
∆ = - 16
g) x² - x - 1 = 0
∆ = b² - 4 .a.c
∆ = ( -1)² - 4.1.(-1)
∆ = 1 - 4
∆ = - 3
h) - x² + 3x - 1 = 0
∆ = b² - 4 .a.c
∆ = 3² - 4.1.1
∆ = 9 - 12
∆ = - 3
i) 2x² - x - 1 = 0
∆ = b² - 4 .a.c
∆ = ( -1)² - 4.2.(-1)
∆ = 1 + 8
∆ = 9
j) -3x² + x + 2 = 0
∆ = b² - 4 .a.c
∆ = 1² - 4.(-3).2
∆ = 1 + 24
∆ = + 25
k) 5x² - 2 + 5 = 0
∆ = b² - 4 .a.c
∆ = ( -6)² - 4.1.9
∆ = 36 - 36
∆ = 0
l) 4x² - 4x + 1 = 0
∆ = b² - 4 .a.c
∆ = ( -4)² - 4.4.1
∆ = 16 - 16
∆ = 0
m) - 2x² + 5x + 7 = 0
∆ = b² - 4 .a.c
∆ = 5² - 4.(-2).7
∆ = 25 + 56
∆ = 81
n) - 2x² + 4x +7 =0
∆ = b² - 4 .a.c
∆ = 4² - 4.(-2).7
∆ = 16 56
∆ = 72
o) x² - 9 = 0
∆ = b² - 4 .a.c
∆ = 0² - 4.1.9
∆ = 0 + 36
∆ = 36
q) 2x² + 7x = 0
∆ = b² - 4 .a.c
∆ = 7² - 4.1.0
∆ = 49 - 0
∆ = 49
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