Factor −20x² + x + 12.

Question

03-06-2018
Mathematics

contestada

Factor −20x² + x + 12.

Respuesta :

Otras preguntas

“Mistress, I dug upon your grave To bury a bone, in case I should be hungry near this spot When passing on my daily trot. I am sorry, but I quite forgot It was

your going to a pool but is one hour away and your father says we are going to the shop that is 2 minutes away witch one will you chose?

A computer radomly picks. A number from the group 20,21,22,23,24,25,26,27 what is the probability of the number being greater then 24 or less then 21 enter your

2r^2+3s^3-r^2+4t^2-r^2 if r=-2, s=-3, and t=5

Why did the United Nations update the Geneva Convention in 1949? A)to help settle disputes between nations before war breaks out B)to promote worldwide peace a

Moose make mating calls to locate potential mates

Please help: What are the Amplitude, Period, Midline, and Phase Shift for f(x) = -5 cos(3x - pi) + 2

When an apple or banana is cut, a chemical reaction with air causes the flesh to turn brown. Placing the fruit in a cold place, such as a refrigerator, can keep

Read this excerpt from Frederick Douglass’s speech “The Hypocrisy of American Slavery.” Fellow citizens, pardon me, and allow me to ask, why am I called upon t

An increased concentration of electrolytes in blood plasma caused by sweating is an example of hemodilution.

Аноним Аноним · Answer 1 · 2018-06-03T22:13:04+02:00

The answer is -(5x-4)(4x+3)

Factor out a negative from the entire expression

−20x² + x + 12
= −(20x² - x - 12)

Find two numbers so that they

⇒ Multiply to get 20 * -12 = -240
⇒ and add to get -1 (coefficient on x term)

These two numbers are -16 and 15 (not very obvious; might have to crunch some numbers)

We can break down the x term using -16 and 15 as coefficients on x

−(20x² - x - 12)
= −(20x² - 16x + 15x - 12)

We factor by grouping. Factor 4x out of 20x² - 16x and 3 out of 15x - 12 to get

= −[ 4x(5x - 4) + 3(5x - 4) ]

Factor out (5x-4) to get

= -(5x-4)[4x + 3]
= -(5x-4)(4x+3)