How do you solve using the completing the square method 5x^2-15x=-25x2−15x=−2?

1 Answer
Binayaka C.
Jan 30, 2017

x =2.86(2dp) or x=0.14(2dp)x=2.86(2dp)orx=0.14(2dp)

Explanation:

5x^2-15x = -2 or 5x^2-15x =-2 or 5(x^2-3x) = -2 or x^2-3x = -2/5 or x^2-3x+(3/2)^2 = -2/5+9/4 or (x-3/2)^2= 37/20 or x-3/2 = +-sqrt (37/20) or x = 3/2 +- sqrt (37/20) :. x =2.86(2dp) or x=0.14(2dp) [Ans]

Related questions
See all questions in Completing the Square
Impact of this question
2849 views around the world
You can reuse this answer
Creative Commons License