need help calc derivative

[knotty sierra]

my answer was (2 - 7x) / (2 sqrt(x))

but the answer is (2 - 9x) / (2 sqrt(x))

[oak pier]

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[knotty sierra]

so first i changed sqrt(x) in the denominator to x^(-1/2) so that it can be in the numerator

and now i have 2x - 3x^(2) + x^(-1/2)

and i derived it and got (2 - 6x + 1x^(-3/2)) / 2

wait

[lucid phoenix]

why did you add it

youre still dividing

[knotty sierra]

mmm

[plain drum]

Should be (2x-3x^2)(x^(-1/2)) ithink since you turn the denominator into nunerator, multiply not add

Then distribute

Then derive both terms

Then should find the answer

Hope you got the answer

[knotty sierra]

+close