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

The average price of a gallon of milk is $3.31. If the price increases .88% each year , how much will a gallon of milk cost in 20 years?

#1 what is the population and what is the sample?

How does Fascism view democracy and liberalism?

Mequon Inc. wishes to lease machinery to Thiensville Company. Thiensville wants the machinery for 4 years, although it has a useful life of 10 years. The machin

In ΔDEF, the measure of ∠F=90°, ED = 65, FE = 56, and DF = 33. What is the value of the cosine of ∠D to the nearest hundredth?

when did germany declare war on the us

What charges must the particles have to create the electric field shown

Solve the equation [tex] {x}^{2} = 196[/tex] Show your work and explain your steps.

The driver of a car slams on the brakes, causing the car to slow down at a rate of 17ft/s2 as the car skids 175ft to a stop. How long does the car take to stop?

Is netie dead in the color purple