Question

x elevado a 2 -5x=104

Answer 1

x² - 5x = 104                                          a=1
                                                               b = - 5
                                                               c = - 104
x² - 5x - 104 = 0
Δ= - b² - 4.a.c
Δ = ( - 5)² - 4. 1. - 104
Δ = 25 + 416
Δ = 441
Δ = 21                             x = b _+ √ Δ / 2.a
                                       X' = - 5 + 21 / 2 = 16 / 2 = 8
                                       x'' = - 5 - 21 / 2 = - 26 / 2 = - 13

s ( 8 , - 13 ).