Top answers

Find the constant term in the binomial expansion of (3x + 2/(x^2))^33

Recall that the general term in the binomial expansion of (x+y)^n is (nCr)(x^n-r)(y^r), so by the binomial theorem, the entire expansion is the sum of these terms from r = 0 to n. In this case, n = 33, the f...
EG
Answered by Elias G. • Maths tutor
8933 Views

Event A: a customer asks for help. Event B a customer makes a purchase. We know: p(B) = 0.2 and p(A) knowing that he has asked for help is 75%. What is the probability of a customer to ask for help and make a purchase?

If we right down all we have here we get:P(A) = X P(B) = 0.2 P(AIB) = 0.75 (P(A) knowing B). And we are looking for P(ANB). We have to use the formula of P(AIB) = P(ANB)/P(B). If we rearrange the equations, ...
DA
Answered by Dan A. • Maths tutor
3236 Views

What's the best strategy when approaching a maths problem?

First of all you need to understand that not every problem can be solved by sistematically applying the same set of steps or rules: sometimes you need to come up with different ways. In order to do that, you...
MI
Answered by Michele I. • Maths tutor
3704 Views

Factorise x^2 + 5x + 6

We are trying to get to the form of x 2 + 5x + 6 = ( x + a)(x + b)6 must also factorise as 6x1 or 3x2 Let's focus first on the x terms : 5x is the sum of ax + dbx and the coefficient of these two must be fac...
MG
Answered by Maëlle G. • Maths tutor
4476 Views

Solve the simultaneous equations to find x and y: 3x + 5y = 10 , 5x + 4y = 8

15x + 25y = 5015x + 12y = 24 y = 2x = 0
DK
Answered by Deo-Gratias K. • Maths tutor
4515 Views