jahajahaja jahajahaja

01-09-2016
Mathematics

contestada

What are the zeros of f(x)=x^2+x-20?
A.x=-2 and x=10
B.x=-10 and x=2
C.x=-5 and x=4
D.x=-4 and x=5

Respuesta :

dalendrk dalendrk

02-09-2016

f(x) = x² + x - 20 = x² + 5x - 4x - 20 = x(x + 5) - 4(x + 5) = (x + 5)(x - 4)

f(x) = 0 ⇔ (x + 5)(x - 4) = 0 ⇔ x + 5 = 0 or x - 4 = 0 ⇒ x = -5 or x = 4

Answer: C. x = -5 and x = 4.

Answer Link

Otras preguntas

Bianca's bank offers a savings account with a 2.1% APR, compounded monthly. What is the actual annual percentage yield on this account? A. 2.19% B. 2.17% C. 2.1

Although _____are the smallest population group in ecuador and peru, they control most of the money and power. a.americans, b.africans, c.asians, d.europeans

A group of actors who refused to answer questions from the huac and were sent to jail?

5hrs 0min - 3hrs 24min

In what kind of economy does the government decide on production and consumption? a. command economy b. mixed economy c. traditional economy d. market econo

The shoe industry has many sellers, many buyers, and similar products. shoe companies function in a_______ market.

What is the ratio of 5:3

Santiago is the name of a. chile’s capital. b. a chilean saint. c. a national park.

You may calm an Agitated person by giving the person a

11. Use the above figure to answer the question. How long is arc ACB if the radius of the circle is 6? Round your answer to two decimal places. A. 25.13 B. 18.8