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July 25, 2014

July 25, 2014

Posted by **Hannah** on Monday, March 15, 2010 at 4:53pm.

Is this equal to sec x?

2) Expand: log7 3 sqrt x / x^2y

3) Find and simplify: f(g)

F(x) = x^2 + 2x g(x) = 2x

x^2 + 2x(2x) = x^2 + 4x

Is this correct?

- Pre-Cal(Please help) -
**Reiny**, Monday, March 15, 2010 at 5:06pm1) (1-cos^2x)(csc x)

= sin^2 x (1/sinx) = sinx

2) log_{7}(3√x/x^(2y))

= log_{7}3 + (1/2)log_{7}x - (2y)log_{7}x

= log_{7}3 + (1/2 - 2y)log_{7}

for 3) did you want to find f(g(x)) ??

what you typed would simply be

f(g) = g^2 + 2g

if it is f(g(x))

then

= (2x)^2 + 2(2x) = 4x^2 + 4x

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