Top answers

Find the equation of the tangent to y = 2x^2 + 7 at x = 3.

The first step here is to identify what to do. Differentiating the equation y = 2x^2 + 7 will result in dy/dx = 4x. Given that you know that x = 3, you can substitute x = 3 into 4x which gives you 4(3) = 12....
DC
Answered by Danielle C. • Maths tutor
4016 Views

How to find the nth term of a quadratic sequence?

Find the difference between each term in the sequence. Then find the second difference, i.e. the difference between each of the primary differences. Divide this by 2, to give you the coefficient of n^2. Now ...
SK
Answered by Sawan K. • Maths tutor
7767 Views

Give the possible values of x when x^2 - 5x + 4 = 0

First, when faced with a question like this you must factorise the expression. So we need to factorise x 2 -5x+4 into 2 linear parts. (Linear terms are terms without any powers of x). To do this, we need to ...
SD
Answered by Sam D. • Maths tutor
6389 Views

Question: Expand (p + 2)(p - 5)

Expanding - or geting rid of brackets. Make sure you multiply everything by everything! Correct: p 2 +2p -5p -10 = p 2 -3p -10 Wrong: p 2 + 2p -5 ...forgot that the -5 also needs to be multiplied by (p+2) Wr...
AN
Answered by Abdul N. • Maths tutor
12413 Views

In a pack of sweets, the ratio of red to blue sweets is 7:5. If there are 25 blue sweets, how many red sweets are there?

Ratios are used to show how things are shared. A ratio of 7:5 means that for every 7 red sweets there are 5 blue sweets. Step 1 - 7 + 5 = 12 This means there are 12 parts to the ratio Step 2 -Blue sweets = 7...
HM
Answered by Holly M. • Maths tutor
6725 Views