panda557
panda557
03-06-2016
Mathematics
contestada
What is x^2+x-20=0.
please help
Respuesta :
meerkat18
meerkat18
03-06-2016
x² + x - 20 = 0
x² = x * x
x = the sum of the factors of -20
-20 ⇒ 1 x 20
2 x 10
- 4 x 5 ⇒ only these factors can arrive to a sum of 1
(x - 4)(x + 5) = x(x+5) - 4(x+5) = x² + 5x - 4x - 20 = x² + x - 20
x - 4 = 0
x = 4
x + 5 = 0
x = -5
Answer Link
VER TODAS LAS RESPUESTAS ( 95+ )
Otras preguntas
A cruise ship makes its way from one island to another. The ship is in motion compared with which reference point? A) the passengers on the ship B) the captain
TRUE OR FALSE The Fifteenth Amendment gave all United States citizens equal rights.
What is the difference between a price floor and a price ceiling? A. A price floor is the minimum price allowed for a good. A price ceiling is the maximum price
why is a group consisting of all wildflowers in a meadow not considered a population
The annual percentage rate on a credit card determines _______ a. the amount of interest you are charged on credit card purchases b. the amount your credit limi
Q2: Explain the difference between the solution to an equation and the solution to an inequality. (dba 3
When a trend line is drawn on a scatterplot, there are 4 points above the trend line. About how many points should be below the trend line? 0 2 4 8 help quick
I need six adaptations that help some humans survive longer than other humans.
Research involves all of the following except
Solve the following inequality. Express the exact answer in interval notation, restricting your attention to 0 ≤ x ≤ 2π. sec^2(x) ≤ 4
