Question

2x²+4x-5=0
delta e baskára

Answer 1

2x² + 4x - 5 = 0
a = 2; b = 4; c = - 5

Δ = b² - 4ac
Δ = 4² - 4.2.(-5)
Δ = 16 - 8.(-5)
Δ = 16 + 40
Δ = 56
√Δ = √4.√14
√Δ = 2√14

x = - b +/- √Δ = - 4 +/- √56
           2a               2.2

x = - 4 + 2√14 = - 1 + √14
            4                     2

x = - 4 - 2√14 = - 1 - √14
            4                   2

==========================
56: 2
28: 2
14: 2
7: 7
1