Question

1. Resolva as equações do 2 grau:

A) (X+1) . (X-2)= -7X-10

B) 4. ($x^{2}$ +2)= 8.(X+1)

2. Racionalize:

A) $\frac{6}{5 \sqrt{22} }$

Answer 1

1.-)resolvet 2do grado de equacao
a)(x+1)(x-2)=-7x-10
x^2-2x+x+2=-7x-10
x^2-x-2=-7x-10
x^2--x+7x-2+10=0
x^2+6x+8=0
a=1. b=6 c= 8
delta=b^2-4ac
delta=6^2-4(1)(8)
delta=36-32
delta=4
x=-b+,-\/delta/2a
x=-6+,-\/4/2(1)
x=-6+-2/2
x1=-6+2/2》x1=-4/2》x1=-2
x2=-6-2/2》x2=-8/2》x2=-4

b)4(x^2+2)=8(x+1)
4x^2+8=8x+8
4x^2-8x+8-8=0
4x^2-8x=0
4x(x-2)=0
4x1=0》x1=0/4》x1=0
x2-2=0》x2=2

2.-)RACIONALIZE
a)6/5\/23
6/5\/22x5\/22/5\/22
30\/22/25x22
30\/22/550(÷5)
6\/22/110(÷2)
3\/22/55