SaltyCosmos
SaltyCosmos SaltyCosmos
  • 03-11-2017
  • Mathematics
contestada

Use the completing the square method to find the roots of 4x2 + 28x = 32.

A) 8, 1

B) 8, -1

C) -8, 1

D) -8, -1

Respuesta :

Аноним Аноним
  • 03-11-2017
First ensure that the x^2 term has a coefficient of 1 by dividing every term by 4:
x^2 + 7x = 8
Then find the value of (b/2)^2 which is 12.25 or 49/4 (7/2)^2
Then add 49/4 to both sides:
x^2 + 7x + 49/4 = 81/4
Then factor the equation into:
(x + 7/2)^2 = 81/4 
Apply the square root property:
+- (x + 7/2) = 9/2 
Solve for x:
x - 7/2 = 9/2 for one root
x = 16/2 
x + 7/2 = 9/2 for the other root
x = 2/2
So, roots are 8 and 1. Hope this helps! 
Answer Link

Otras preguntas

What happens to the coordinate of a point when you rotate it 90 clockwise
Can someone help me PLEASE?! I need to write a 300 word summary about chapter 13 of To Kill A Mockingbird by Harper Lee. Thank you!
SOMEONE HELP IM STUCK LOL
someone help me with intro :) it about the great Gatsby
The number of blue fish to red fish in a tank is proportional. If there are 34 blue fish and 50 red fish in Tank A, how many blue fish are in Tank B if there ar
Photos-To-Go printed 2,102 copies of a brochure for a travel agency. The brochure included 5 photos of popular vacation destinations. How many times will all 5
In the sentence below, the underlined portion is a clause. Identify the type of clause. The battery which I bought last weekend is defective. O Independent clau
I NEED PLEASE IT WOULD REALLY HELP ME ALOT !! NO LINK OR ZOOMS
why windows of the room become misty on a cold day​
the sum of a and 3a is​