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

Otras preguntas

Justin lives in saint paul and goes to school in minneapolis. in the morning, he has 333 transportation options (bus, cab, or train) to school, and in the eveni

Charles Darwin gathered a lot of data about the natural world over a 5 year period as he traveled the coastline of South America and the Galapagos Islands. Whic

Explain the effect that extreme vagus nerve stimulation had on the heart. how well did the results compare with your prediction?

Raj made this argument: The Triangle Inequality Theorem states that if the lengths of three sides of a triangle are a, b, and c, then a + b > c. For this r

Where in tkam does it state jem touching radley house?

A teacher asks 90 students who drive how many speeding tickets they received in the last year. predict the shape of the distribution and explain. select the cor

Until the early 20th century, few restrictions on immigration to the united states existed primarily because

Determine whether the vectors u and v are parallel, orthogonal, or neither. u = <1, -2>, v = <-4, 8> A) Orthogonal B) Neither C) Parallel

show how long is 1/8 long cord

causes of air pollution and its effects