Question

resolva as equação quadrática:
a)x2+0x-9=0
b)x2+4x-5=0​

Answer 1

Explicação passo-a-passo:

• a) x2 + 0x -9=0. valores de: a=1;b=0; c=-9
• ∆=b2-4.a.c
• ∆= 0^2 - 4.1.(-9)
• ∆= 0+36
• ∆= 36
• √∆= 6

X1= -b+√∆ X2= -b-√∆

2a 2a

X1= 0+6 X2= 0-6

2.1 2.1

X1= 3 X2= -3

• b) x2 + 4x - 5=0. valores de: a= 1; b= 4 & c= -5

• ∆=b2-4.a.c
• ∆=b2-4.a.c
• ∆= 4^2 - 4.1.(-5)
• ∆= 16+20
• ∆= 36
• √∆= 6

X1= -b+√∆ X2= -b-√∆

2a 2a

X1= -4+6 X2= -4-6

2.1 2.1

X1= 1 X2= -5