Question

a) x² - 4x - 5 = 0

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Answer 1

x² - 4x - 5 = 0

a= 1 b= -4 c= -5

Δ= b²-4.a.c

Δ= (-4)² - 4. 1. (-5)

Δ= 16 +20

Δ= 36

        -b+- √Δ

x =  ------------

             2.a

x= -(-4) +-√36

2.1

x= 4+-6

2

x1= 4+6 = 10 = 5

2 2

x2= 4-6 = -2 = -1

2 2