Question

what is the following is a root of quadratic equation x^2+5x-6=0 ?
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Answer 1

x² + 5x - 6 = 0

a = 1 ; b = 5 ; c = - 6

Δ = b² - 4ac

Δ = 5² - 4.1.(- 6)

Δ = 25 + 24

Δ = 49

x = (- b ± √Δ)/2a

x = (- 5 ± √49)/2.1

x = (- 5 ± 7)/2

x1 = (- 5 + 7)/2 = 2/2 = 1

x2 = (- 5 - 7)/2 = - 12/2 = - 6