bkpolymers1617 wrote:
Bunuel wrote:
sidagar wrote:
hi brunel
Question stem asks if √x <2.5x−5
we know x is positive , so squaring both sides gives x< 6.25x^2 + 25 - 25x i.e 26x< 6.25x^2 + 25
so if put 1 answer is yes. for x = 2 answer is no.How can answer be A
Question stem asks if √x <2.5x−5
we know x is positive , so squaring both sides gives x< 6.25x^2 + 25 - 25x i.e 26x< 6.25x^2 + 25
so if put 1 answer is yes. for x = 2 answer is no.How can answer be A
Why are you squaring? We can only square inequality when we are certain that both sides are non-negative. We don't know that.
Also, you really do not need to square put x = 1 and x = 2 into √x <2.5x −5. What do you get?
Hey Bunuel- I know there is no need to square
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