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

Question is on photo
Help please please please
What should an outline for an argumentative essay include? Check all that apply. 1) a statement that expresses the claim 2) reasons why the claim is correct 3)
again sorry to everybody but plesse help
What did the War Powers Resolution of 1973 do?
The second electron transport chain ends with a(n) ______ that creates NADPH. a. enzymeB. glucoseC.waterD. none of the above2. What mediates the reduction of ca
What are the characteristics of successful budgets? What can you do to cultivate these successful characteristics in your own money management?
Which process is the first step in making a protein from dna instructions
Line JK passes through points J(–3, 11) and K(1, –3). What is the equation of line JK in standard form?
OF Bisects EOG. M EOF = y+ 30 and M FOG = 3y - 50. Solve for y