Asked by Sandra
x2(squared)-12=-x
solve by completing the square
solve by completing the square
Answers
Answered by
PsyDAG
x^2 - 12 = x
Subtract x from both sides.
x^2 - x - 12 = 0
Find two factors of -12 that would add to give the value of -1(x) in the middle term (-4,3) (-3,4)(-6,2)
(-2,6). (If the x^2 term is preceded by a number other than one, you need to find the two factors for that also.)
(x-4)(x+3) = 0
x = 4 or -3
Subtract x from both sides.
x^2 - x - 12 = 0
Find two factors of -12 that would add to give the value of -1(x) in the middle term (-4,3) (-3,4)(-6,2)
(-2,6). (If the x^2 term is preceded by a number other than one, you need to find the two factors for that also.)
(x-4)(x+3) = 0
x = 4 or -3
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