Respostas

2013-12-09T18:41:44-02:00
A=1/B=-7/C=10
Delta=b^2-4.a.c
D=(-7)^2-4.1.10
D=49-40
D=9
X=-b+/-Raiz de 9/2.a
X'=-(-7)+3/2=5
x"=-(-7)-3/2=2
  • Usuário do Brainly
2013-12-09T18:43:07-02:00
x²-7x+10=0
Δ=(-7)²-4.1.10
Δ=49-40
Δ=9

x= \frac{7+- \sqrt{9} }{2.1} \\\\
x= \frac{7+-3}{2} \\\\
x'= \frac{7+3}{2} \\\\
x'= \frac{10}{2}\\\\
x'=5\\\\
x"= \frac{7-3}{2}\\\\
x"= \frac{4}{2}\\\\
x"2 \\\\
V=\{5,2\}

Tchau, 
Espero ter ajudado
=)