SOLUTION: A)4x^2 � 27 = 0 B) 4x^2 � 8x � 5 = 0 C) 4x^2 � 8x � 12 = 0 D) 4x^2 � 9x � 7 = 0 Can you please help me match up if (factoring, Square root property, Completing the square or Qu

Question 1017694: A)4x^2 � 27 = 0
B) 4x^2 � 8x � 5 = 0
C) 4x^2 � 8x � 12 = 0
D) 4x^2 � 9x � 7 = 0
Can you please help me match up if (factoring, Square root property, Completing the square or Quadratic formula) go with A,B,C,D thank you. I need one for each equation.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
A)4x^2 � 27 = 0
4x^2=27
square root of both
2x=sqrt (27)
x=(1/2) sqrt (27)
----------------
B) 4x^2 � 8x � 5 = 0
factor
(2x-5)(2x+1)=0
x=5/2,-1/2

C) 4x^2 � 8x � 12 = 0
first factor out a 4
4(x^2-2x-3)=0
This factors into 4(x-3)(x+1)=0, x=3,-1
D) 4x^2 � 9x � 7 = 0
Use quadratic formula here.
x=(1/8)(9+/-sqrt (81+112)); sqrt 193=13.89
numerical (1/8)(9+/-13.89)=2.86 , -0.61

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