luicd luicd
  • 13-05-2016
  • Mathematics
contestada

x^2+4x=7 using the quadratic formula?

Respuesta :

apologiabiology
apologiabiology apologiabiology
  • 13-05-2016
when you have
ax^2+bx+c=0
x=[tex] \frac{-b+/- \sqrt{b^{2}-4ac} }{2a} [/tex]


1x^2+4x=7
minus 7
1x^2+4x-7=0
a=1
b=4
c=-7
sub

x=[tex] \frac{-4+/- \sqrt{4^{2}-4(1)(-7)} }{2(1)} [/tex]
x=[tex] \frac{-4+/- \sqrt{16+28} }{2} [/tex]
x=[tex] \frac{-4+/- \sqrt{44} }{2} [/tex]
x=[tex] \frac{-4+/- 2\sqrt{11} }{2} [/tex]
x=[tex] -2+/- \sqrt{11} [/tex]

x=[tex] -2+ \sqrt{11} [/tex] or [tex] -2- \sqrt{11} [/tex]

Answer Link

Otras preguntas

experienced health care professional can move dying client out of denial state
What is the vertex of the graph of f(x) = x + 51-6? O(-6.-5) O (-6.5) O (-5,-6) O (5,-6)
Ex #1: Identify all lines. and line segments
Which systems in the body compare to the heating cooling electrical plumbing systems of a house
For the function p defined by p(m) = 2m² - 4m +3, find p(| - 3]).
reasons why water is a good cooling agent in machines​
Reread paragraph 5. How does this paragraph contribute to the plot of the text? A. It introduces the Griffin as a vain and self-centered character who is obsess
in the expression 2m-5, which is the coefficient ?
One of the most common errors new foodservice operators experience is pricing their food too low, thinking that they can undercut competitors. Explain why this
What is Setting(Time and Place) in the book shadow school