factor or use quadratic formula i prefer factoring but somethings cant be factor
like this one you cant factor it so use quadratic formula
-b plus or minus the square root of (b^2 -4AC) all of that divided by 2A
A= 1(bc of the 1 in front of the x^2)
b= 14( from the 14x)
C=-4
x^2 + 14x - 4 = 0 Solve please?
4 answers
I would complete the square..
(I use this method when the coefficient of the square term is 1 and the middle term is even)
x^2 + 14x + 49 = 4 + 49
(x+7)^2 = 53
x +7 = ±√53
x = -7 ± √53
(I use this method when the coefficient of the square term is 1 and the middle term is even)
x^2 + 14x + 49 = 4 + 49
(x+7)^2 = 53
x +7 = ±√53
x = -7 ± √53
oh man i forgot about that method completely lol
It has the advantage over the formula in that it gives you the reduced form of the square root answer right away, while often the answer from the formula has to be simplified.
1 answer