Which of the following is the correct factored form of the given equation?

x2 + 3x - 4 = 0
(x - 1)(x + 4) = 0
(x - 1)(x - 4) = 0
(x + 1)(x - 4) = 0

Question

Which of the following is the correct factored form of the given equation?

x2 + 3x - 4 = 0
(x - 1)(x + 4) = 0
(x - 1)(x - 4) = 0
(x + 1)(x - 4) = 0

anonymous · Answer

$$ x^2 + 3x - 4 = x^2 + 4x - x - 4 =  (x-1)(x-4) =0 $$

kirbykirby · Answer

No it's (x-1)(x+4)

kirbykirby · Answer

Which two numbers allow you to get 4 when multiplied, but 3 when added together? -1 and 4, hence (x - 1)(x + 4)
If you expand it you get x^2 + 4x - x - 4 = x^2 +3x -4

anonymous · Answer

think about which factors of 4 (1,2,and,4) will add or subtract to equal 3. it must by 4 minus 1 = 3

anonymous · Answer

which is it ?

kirbykirby · Answer

If you need more proof, here's a link http://www.wolframalpha.com/input/?i=x^2%2B3x-4%3D0+factor