Question

Resolva as equações:

Answer 1

Resposta:

Explicação passo a passo:

a.

a=1

b=-7

c=12

x=7+-V(-7)²-4.1.12/2.1

x=7+-V49-48/2

x=7+-V1/2

x=7+-1/2

x'=7+1/2=8/2=4

x''=7-1/2=6/2=3

S={3,4}

b.

a=1

b=3

c=-4

x=-3+-V3²-4.1.-4/2.1

x=-3+-V9+16/2

x=-3+-V25/2

x=-3+-5/2

x'=-3-5/2=-8/2=-4

x''=-3+5/2=2/2=1

S={-4,1}

c.

a=1

b=-3

c=-10

x=3+-V(-3)²-4.1.-10/2.1

x=3+-V9+40/2

x=3+-V49/2

x=3+-7/2

x'=3+7/2=10/2=5

x''=3-7/2=-4/2=-2

S={-2,5}

d.

a=1

b=4

c=-12

x=-4+-V4²-4.1.-12/2.1

x=-4+-V16+64/2

x=-4+-V64/2

x=-4+-8/2

x'=-4+8/2=4/2=2

x''=-4-8/2=-12/2=-6

S={-6,2}