IHateAlgebra IHateAlgebra
  • 07-04-2014
  • Mathematics
contestada

What is 5r^2 = 80

It says solve each equation with the quadratic formula.

Respuesta :

Lilith
Lilith Lilith
  • 08-04-2014
[tex]5r^2 = 80 \ \ /:5\\ \\r^2=\frac{80}{5}\\ \\r^2=16\\ \\r^2-16=0\\ \\ r^2 - 4^2 =0 \\ \\(r-4)(r+4)=0[/tex]

[tex]r-4=0 \ \ \vee \ \ r+4 =0 \\ \\r=4 \ \ \vee \ \ r = -4 \\ \\ \\ a^2-b^2 = (a- b)(a+b)[/tex]


Answer Link

Otras preguntas

Name two decimals that are equivalent to 7.7?
how do you solve x/3-7x/12=2/3?
what is the length of time called that an organism is expected to live?a. life span            b. homeostasisc. stimulus             d. theory
8.7204 i expanded form
Find the difference between 827 and 533
what times 3 equals 20
a poster of your favorite band has a width of 15 inches you have a space on your wall that has a width of 1.2 feet will the poster fit explain
The area of a square field is 200 square feet.what is the approximate length of each side of the field ? Round your answer to the nearest foot
how can I get Y result?5y+38 = 180
How do u write two and fifty nine hundredths in standard form