Top answers

How do i answer a problem solving question if I don't know where to start?

This is a very common question as many people tend to not know here to begin in regards to answering most problem solving questions generally. My advice would be to approach the question the way i would; beg...
EM
Answered by Elizabeth M. • Maths tutor
2958 Views

f(x) = (x + 1)^2 and g(x) = 2(x - 1) Show that gf(x) = 2x(x + 2)

For this question, as we are looking for gf(x) so we first need to plug in our formula for f(x) into the g(x) formula, giving us: 2((x+1)^2 - 1) We can then expand our squared bracket to get: 2(x^2 + 2x + 1 ...
DM
Answered by Django M. • Maths tutor
3259 Views

y is inversely proportional to x. When y = 2, x = 3. Work out the value of y when x = 18.

We have that y is inversely proportional to x, which we write mathematically as y ∝ 1/ x. We need to be able to solve this, so we re-write this expression as an equations, y = k/x, where k is the constant of...
LM
Answered by Lauren M. • Maths tutor
21066 Views

How do I solve the simultaneous equations 3x+2y=17, 4x-y=30?

Lets number the equations: 1) 3x + 2y = 17 2) 4x - y = 30If we double equation 2) we will get matching y coefficients so:8x - 2y = 60 if we rearrange this to be 8x-60 = 2y Then if we put these together: 3x +...
VL
Answered by Vicki L. • Maths tutor
4050 Views

Solve the following simultaneous equations: (1) 2y + x = 8, (2) 1 + y = 2x

The first aim is to obtain an expression for one of the unknowns in terms of the other. To achieve this, addition and subtraction methods are used. For example, using equation 1, subtracting 2y from both sid...
BJ
Answered by Benjamin J. • Maths tutor
2882 Views