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9 Answered Questions for the topic IB

09/17/17

in the expansion of (3x+1)^n, the coefficient of the term in x^2 is 135n, where n E Z+. Find n.
I don't have any idea how to do this! i know how to do binomial theorem but not this. I live in the US and taking Ib sl 2 math as a junior.
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04/27/17

Application of differentiation
The velocity v m s –1 of a particle at time t seconds, is given by v = 2t + cos2t, for 0 ≤ t ≤ 2. (a) Write down the velocity of the particle when t = 0.   When t = k, the acceleration is... more
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04/06/15

Geometric Sequence Common Ratio
The third term of a geometric sequence is 12 and the fifth term is 16/3. All the terms in the sequence are positive. Calculate the value of the common ratio.   Can someone please guide me through... more
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02/19/15

Writing equations for lines...
Write an equation for the line tangent to the curve f(x) = 4ex - 7 at x = ln 3   Could someone please explain how I might go about answering this question? Thank you!
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02/19/15

Derivatives of ex and ln x
An example in my textbook goes as follows: f(x)=ln e3x     = 3x f'(x) = 3   I understand that the derivative of 3x is 3, that the derivative of ex is ex, ,and that the derivative of ln x is 1... more
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01/26/15

Derivative
Find the derivative of f(x) = x2e–x I've managed some of the question but am having trouble finishing it. Can someone please explain?
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01/25/15

Derivative
Find the derivative of f(x)=xsquared(2x-3)to power of 4   sorry i couldn't write the powers out on my phone. Can someone please explain the question?
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10/29/14

IB Maths Inverse Functions Explanation
In an example question in my textbook that asks for the inverse of f(x) = 4 - 3x the answer goes as follows:   y=4-3x x=4-3y x-4=-3y x-f/-3 = y y=4-x/3   I do not understand how x-f/-3 = y... more
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09/24/14

Log2 x = logx 2
Logbase2 of x = logbasex of 2    
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