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# math

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x^2-3x=88

Guest Mar 30, 2017
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#1
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x^2 - 3x  = 88    subtract 88 from both sides

x^2 - 3x  - 88 = 0   factor

(x - 11) ( x + 8)  =  0     setting both factors to 0 and  solving for x and x = 11  or x  =  - 8

CPhill  Mar 30, 2017
edited by CPhill  Mar 30, 2017
#2
+1

Or after substracting 88 you could apply the formula for second degree equations, if you're not good at factoing. You have to be sure you have arranged well all the numbers.

$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}$$

Where, in this particular case, a=1, b=3, and c=(-88). It will give you the two results after splitting the equation in the sum and substraction due to the "add AND/OR substract" sign.

Guest Mar 30, 2017

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