Question

Resolva equaçoes do 2 Grau na forma de delta :
x²-7x+10=0
x²-7x+12=0
x²-5x+4=0
x²-4x+4=0

Answer 1

x²-7x+10=0D= b²-4.a.cD=(-7)²-4.1.10D=49-40D=9

x²-7x+12=0
D=b²-4.a.c
D=(7)²-4.1.12
D=49-48
D=1

x²-5x+4=0
D=b²-4.a.c
D=(-5)²-4.1.4
D=25-16
D=9

x²-4x+4=0
D=b²-4.a.c
D=(-4)²-4.1.4
D=16-16
D=0