Question
Thu November 24, 2011 By:

Is(x-3)(x+3)=40?why?How to solve it

Expert Reply
Thu November 24, 2011
This is a quadratic equation. It can be anything on the left hand side
or the right hand side. Its solution is given as follows
 
x2-9 = 40
 
or x2=49
 
or x = ±7
 
this is the answer
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