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Mathematics 14 Online
OpenStudy (anonymous):

x^2-9x=36

OpenStudy (cwrw238):

x^2 - 9x - 36 = 0 to solve this we need to factor can u do this?

OpenStudy (anonymous):

idk

OpenStudy (cwrw238):

ok this will factor to the form (x +/- a)(x +/- b) = 0 the values of a and b will have ab = -36 and a + b = -9

OpenStudy (cwrw238):

factoring -36 will help -36 = -2*2*3*3

OpenStudy (anonymous):

ok thanks

OpenStudy (cwrw238):

yw note 3*-12 = 36 and 3 + -12 = -9

OpenStudy (cwrw238):

** 3* -12 = -36

OpenStudy (anonymous):

so -12 and 3

OpenStudy (anonymous):

no -3 and 12

OpenStudy (cwrw238):

yes giving (x - 12)(x + 3) on expanding the middle term becomes -12x + 3x = -9x

OpenStudy (anonymous):

ok thanks alot '')

OpenStudy (cwrw238):

-12 and + 3

OpenStudy (cwrw238):

your first post was correct +12 and -3 = +9

OpenStudy (anonymous):

k

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