IDNStudy.com, ang iyong mapagkakatiwalaang platform para sa mga eksaktong sagot. Sumali sa aming platform ng tanong at sagot upang makakuha ng eksaktong tugon sa lahat ng iyong mahahalagang tanong.

Completing the square
2x^2-12x=15
pano po ba isolve yan? ung whole solution po please :'(


Sagot :

2x^2-12x=15
2x^2-12x+36=15+36
2x^2-12x+36= 51
(x-6)^2 = 51
(x-6) = +- 51
I think this is the right answer. I did the checking and I got it right. ^_^ 

Given: 2x^2-12x=15 

2x^2-12x=15
X^2-6x=15/2
X^2-6x+9=15/2+9
(x-3)^2 = 33/2

(x-3)^2 = 33/2 
x-3 =√33/√2
x-3 =(√33/√2)(√2/√2)
x-3 = ±√66/2   

x-3= √66/2 
x = √66/2 + 3 
x = (6+√66)/2   

x-3= - √66/2 
x =  - √66/2 + 3 
x = (6-√66)/2  

checking:

2x^2-12x=15 
2[(6-√66)/2]^2 – 12[(6-√66)/2] = 15
2[(36-6√66-6√66+66)/4] – [6(6-√66)] = 15
2[(102-12√66)/4] – [36-6√66] = 15 
2[6(17-2√66)/4] – [36-6√66] = 15
 2[3(17-2√66)/2] – [36-6√66] = 15 
3(17-2√66) – [36-6√66] = 15
51 – 6√66 -36+6√66 = 15
 15 = 15