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

Memory, problem solving, and multitasking are all functions of the __________ lobe.

in what ways, would underdstanding the body positions, directions, and planes assist you with tasks related to the integumentary, skeletal/muscular, and digesti

a european cheese making recipe calls for 2.50 kg of whole milk. An american wishes to make the recipe has only measuring cups, which are marked in cups. If the

How long does it take to bleed out from a gunshot to the stomach?

Why did many states initially refused to ratify the constitution?

Identify the complete verb: she has been doing yoga for years.

Why do a car's tires need more air in the winter than I do in the summer

When did modern humans, or Homo sapiens firs appear

Graph the image of the given triangle after the transformation with the rule (x, y)→(y, x) .

Each element in a given compound comprises a fixed percent by