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 ( 46+ )
Otras preguntas
Wich process producers only identical offspring
How were the french settlements different from and similar to the Spanish settlements?
PLEASEEEE HELLLPP: A team mom ordered 100 pizzas for $1255. Cheese pizzas cost $11.50 each and pepperoni pizzas cost $13.00 each. Identify and define your var
Which of the following is NOT a characteristic of a state? a. ethnicity b. territory c. population d. sovereignty
14a +28c=7 solve for c
An air track car with a mass of 0.75 kg and a velocity of 8.5 m/s to the right collides elastically with a 0.65kg car moving to the left with a velocity of 7.2m
Which of the following statements is most accurate regarding America's political climate between 1876 and 1896? A. The influence o the president over Congress
As a 5.0 × 10^2-newton basketball player jumps from the floor up toward the basket, the magnitude of the force of her feet on the floor is 1.0 × 10^3 newtons. A
One result of the War of 1812 was that the United States (1) acquired French-held territory in southern Canada (2) maintained its independence and its territory
A radioactive element X with atomic number 88 and mass number 226 emits in succession:1)alpha particle 2)a beta particle 3)gamma radiation Explain using equatio
