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

Newton's second law shows that there is a(n) ________ relationship between the acceleration of an object and its mass

According to Darwin's theory of evolution, what causes a struggle for survival in populations? * 1. overproduction of offspring 2.favorable heritable variations

You bought a winter coat for S48.75. The original price was $75. What percent of the original price did you pay for the coat?

please help this question hurts my brain and it is hard as hell man

6) The exterior angle to the vertex angle of an isosceles triangle has measure 250. What is the measure of each base angle of the triangle?

if a car travels 374 meters in 17 seconds. A bus travels 414 meters in 23 seconds which vehicle is faster how much faster

describe how mexican artists and las casas perceived pre-Columbian american civilization

Aiden spent at least $135 on tickets to the Cubs game. Write an inequality for the situation.

Write a numerical expression for the phrase. The sum of - 1 and 2 and 4

You buy a new car for $2000. Find the sales tax you would pay when buying the car? (9.25% tax)