Question 386047: ok so i dont kno if this is in the right catagory or not! SORRY!
1. Given the problem x^2 -4x=8
A. Complete the trinomial square (remember that whatever you do to the left side, of the
equation, you must also do to the right side.)
B. Solve the equation from A. Express your answer in simplest radical form.
THANK YOU IN ADVANCE THIS IS HARD FOR ME
Answer by scott8148(6628)   (Show Source):
You can put this solution on YOUR website! when you complete the square , you are squaring some binomial of the form (x + ?)
so squaring (x + ?) gives ___ x^ + 2?x + ?^2
in this case , 2?x = -4x
dividing by 2x ___ ? = -2
(x - 2)^2 = x^2 - 4x + 4
so you add 4 to the original equation ___ x^2 - 4x + 4 = 12 ___ (x - 2)^2 = 12
taking square root ___ x - 2 = ± sqrt(12)
adding 2 , and simplifying ___ x = 2 ± [2 sqrt(3)]
|
|
|
