Fórmula Bhaskara A-x²-3x=0 B-x²+4x+5=0 C-x²-11x+30=0 D-x²+4x-21=0 E-X²-36=0 F- -X²+2X+8=0 G- x²+10x+25=0 alguém disposto a resolver?
Soluções para a tarefa
A-x²-3x=0
delta= (-3)^2-4.(1).0=9
x=3+/-V9 => x=3+/- 3 ==> x1=3+3 = - 3 ; x2=3-3 = 0
2.(1) 2 2 2
B-x²+4x+5=0
delta= (4)^2^-4.(1).5= - 4
raizes negativas delta < 0
C-x²-11x+30=0
delta= (-11)^2-4.1.30=121-120=1
x=11+/-V1 => x=11+/- 1 ==> x1=11+1 = 7 ; x2=11-1 = 5
2.1 2 2 2
D-x²+4x-21=0
delta= (4)^2-4.1.(21)=16+84= 100
x= -4+/-V100 => x= -4+/- 10 ==> x1= -4+10 = 3 ; x2= -4-10 = -7
2.(1) 2 2 2
E-X²-36=0
delta= (0)^-4.1.(-36)=0+144 = 144
x=0+/-V144 => x=0+/- 12 ==> x1=0+12 = 6 ; x2= 0-12 = -6
2.1 2 2 2
F- -X²+2X+8=0
delta= (2)^2-4.(-1).8=4+32=36
x=-2+/-V36 => x= -2+/- 6 ==> x1= -2+6 = -2 ; x2=-2-6 = 4
2.(-1) 4 -2 4 -2 -2
G- x²+10x+25=0
delta= (10)^2-4.(1).25=100-100=0
x=-10+/-V0 => x=-10+/- 0 ==> x1=- 10 +0 = - 5 ; x2= -10-0 = - 5
2.(1) 2 2 2