Asked by bat
hello, can you help me to solve this question?
x^2+9>0
thank you''
x^2+9>0
thank you''
Answers
Answered by
bobpursley
(x+3)(x-3)>0
which means x cannot be 3, or -3
Then test to see if the inequality is good for -inf<x<-3, from -3<x<3, and from 3<x<inf
which means x cannot be 3, or -3
Then test to see if the inequality is good for -inf<x<-3, from -3<x<3, and from 3<x<inf
Answered by
Guido
bobpursley,
How can you factor x^2 + 9 into
(x - 3) (x + 3) when there is a PLUS sign between x^2 and the constant 9?
Get my point?
How can you factor x^2 + 9 into
(x - 3) (x + 3) when there is a PLUS sign between x^2 and the constant 9?
Get my point?
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