Solve the quadratic equation x^2 - x = 30 by completing the square.
A. {-5, 6}
B. {-5, -6}
C. {4, 5}
D. {-4, -5}

Question

Solve the quadratic equation x^2 - x = 30 by completing the square.
	A.	{-5, 6}
	B.	{-5, -6}
	C.	{4, 5}
	D.	{-4, -5}

anonymous · Answer

@ucreategames

johnweldon1993 · Answer

You need to take the coefficient of the  'x' term (-1 here)   divide it by 2....then square the result....you then add this to both sides of the equation...

so -1/2 = -1/2  

(-1/2)^2 = 1/4

Added to both sides

x^2 - x + 1/4 = 30 + 1/4

x^2 - x + 1/4 = 121/4

Now turn the left side into a result of squares...

(x - (1/2))^2 = 121/4

Take the square root of both sides of the equation

x - (1/2) = √121/4

x - (1/2) = +/- 11/2

Break into 2 equations...

x - (1/2) = 11/2

x - (1/2) = -11/2

Add 1/2 to both sides of each equation

x = 12/2 = 6

and

x = -10/2 = -5

(6 and -5) are your answers

anonymous · Answer

true, but thats not one of the options

johnweldon1993 · Answer

...look at the first choice...

anonymous · Answer

true i was trippen, lol thank you !!

johnweldon1993 · Answer

Lol no prob!