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Solve using the factoring method

Submitted by Olin on 11. February 2007 - 7:36
3x2 = 75
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We have 3x2 =

Submitted by Tutor on 11. February 2007 - 7:37.

We have 3x2 = 75       

 or

3x2 -75=0

 Taking 3 as common factor we have

3(x2 – 15)=0

or

x2 -15=0

or

(x-√15)(x+√15)=0

x=√15 and x =-√15 answer
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