Top answers

Binomially expand the equation (2+kx)^-3

(2+kx) -3 = (2 -3 )(1+kx/2) -3 = (2 -3 )(1+(-3)(kx/2) + [(-3)(-4)]/2! (kx/2) 2 + [(-3)(-4)(-5)]/3! (kx/2) 3 +... ) = 1⁄8 [1 -(3kx/2) + (12⁄2 k 2 x 2 /4) + (60⁄6 k 3 x 3 /8) + ...] = 1⁄8 [1 - (3⁄2 kx) + ( 3⁄2...
CH
Answered by Christopher H. • Maths tutor
9833 Views

How would I start to answer an unseen prose/poetry question?

Unseen prose and poetry can seem scary, but it's actually really simple to get your head around what the author of the piece is actually trying to say, as well as how you can best answer the question. First ...
EF
12662 Views

How does the Additional Members System work?

This is a really useful system to get your head around because its one of the only examples of a hybrid electoral system. Since it is such an unusual combination, its great for bringing into questions about ...
IB
Answered by Imogen B. • Politics tutor
4326 Views

Solve the simultaneous equations: 2x + y = 18, x - y =6.

There are 2 different ways to approach solving simultaneous equations: 1) making x or y the subject of one of the equations.2) addition or subtraction method.In this section, I will explain the first method....
JG
Answered by Jamini G. • Maths tutor
17719 Views

Why do insulin levels rise in the body following a meal, and what effects does the insulin have?

a) Why do insulin levels rise? After we have eaten, the carbohydrates in the food are broken down to glucose, which is absorbed in our intestines. This means that the level of glucose in our blood rises afte...
TD
3625 Views