Question

problemas matemática equação de 2 grau

Answer 1

13)

x²-3x=40
x²-3x-40=0

∆=(-3)²-4.1.(-40)
∆=9+160
∆=169

x=[-(-3)±√169]/2.1
x=[3±13])2

x'=(3+13)/2=16/2=8

x''=(3-13)/2=-10/2=-5



14)

3x²-2x=40
3x²-2x-40=0

∆=(-2)²-4.3.(-40)
∆=4+480
∆=484

x=[-(-2)±√484]/2.3
x=[2±22]/6

x'=(2+22)/6=24/6=4

x''=(2-22)/6=-20/6=-10/3