Question

Qual o delta de: (com a conta)
a) x²-8x+15=0
b) x²+10x+24=0
c) x²-4x+3=0
d) x²+4x-12=0
e) x²-2x+3=0

Answer 1

OLA!

A)x² - 8x + 15 = 0

a = 1, b = - 8, c = 15

∆ = b² - 4ac
∆ = ( - 8 )² - 4 • 1 • 15
∆ = 64 - 60
∆ = 4

B)x²+10x+24=0

a=1;b=10;c=24
∆ = b² - 4ac
∆ =(10)²-4.1.24
∆ = 100-96
∆ = 4
 
C)x²-4x+3=0
a=1;b=-4;c=3
∆=(-4)²-4.1.3
∆=16-12
∆=4

D)x²+4x-12=0
a=1;b=4;c=-12
∆=(4)²-4.1.(-12)
∆=16+48
∆=64

E)x²-2x+3=0
a=1;b=-2;c=3
∆=(-2)²-4.1.3
∆=4-12
∆=8