Question

Resolva as equações
a) x²=7×-10
b)X+(X+1)=30
c)X²+2(X+1)=5
d)2X(4X-2)-4=0
e)(6X+2)²-16=0
f)(X+1)²=X+7
g)(2X-3)²=8X
h)4X+1)²=(3X-7)²

Answer 1

Resposta:

a) S={2,5}

Explicação passo-a-passo:

a) x²=7x-10

x²-7x+10=0

a=1

b=-7

c=10

∆=b²-4.a.c

∆=49-4.1.10

∆=49-40

∆=9

x= -b±✓∆/2.a

x=7±✓9/2.1

x1=7+3/2

x1=10/2

x1=5

x2=7-3/2

x2=4/2

x2=2