Math - factoring

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Solve by factoring:

1.) x^2 - x - 12 = 0

  • Math - factoring -

    What are the factors of 12? (6 & 2, 3 & 4)

    Which combination of those will add to -1?

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

    x = 4 or -3

  • Math - factoring -

    First in these type of problems if there is a variable that is squared i always start by putting those in first

    1) (x ) (x )

    then i decide if im going to need a - or + and in this case because we want to make it - we have to put one of each

    2)(x- )(x+ )

    then i just start by plugging in numbers and the correct answer i found was..

    (x-4)(x+3)

    if you need help on others just post em:)

  • Math - factoring -

    of yes. sorry i almost forget

    whenever solving for x

    take the problem

    (x-4)(x+3)

    and make each their own equation

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

    then add the 4 and the subtract the three and you get

    x=4,-3

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