Top answers

a)By completing the square, prove the quadratic formula starting from ax^2+bx+c=0, b) hence, or otherwise solve 3x^2 + 7x -2= 9, to 3s.f.

a)starting from ax 2 +bx+c=0, divide through by a, x 2 +(b/a)x+c/a=0, complete the square (x+(b/2a)) 2 -(b/2a) 2 +c/a=0, expand (x+(b/2a)) 2 -(b 2 /4a 2 )+c/a=0, Combine fractions and rearrange,(x+(b/2a)) 2 ...
YH
Answered by Yusuf H. • Maths tutor
3880 Views

In an experiment a burrette was identified as the largest source of uncertainty, how could this uncertainty be reduced?

A burrette is a measuring apparatus a burrette measures the volume of liquid delivered during a titration. with each measurement there is an uncertainty with the recorded measurement of delivered liquid. Whe...
JG
Answered by Jarrod G. • Chemistry tutor
14644 Views

Outline the change we have seen in organisational culture using examples. Discuss whether the idea of culture can be managed.

The word ‘Culture’, is, as argued by Peter, one of the most complicated words in the human language. Prior to outlining how culture has changed and discussing whether it can be managed, we firstly need to de...
JW
1940 Views

find the diffrential of 3sin2x+4cos2x

dy/dx=6cos2x-8sin2xExplanation: cos x difrentiates to -sinx, we must times the coefficient of cos2x,(4) , by the differential of 2x (ie 2), giving -(4x2)sin2x.Similarly, sinx differentiates cosx, so using th...
AC
Answered by Amy C. • Maths tutor
6216 Views

You have three keys in your pocket which you extract in a random way to unlock a lock. Assume that exactly one key opens the door when you pick it out of your pocket. Find the expectation value of the number of times you need to pick out a key to unlock.

Let X be the random variable for this question. P(X=x) = 1/3 for all x. When X=x, we have that it took x times for us to retrieve the correct key.Thus, we have the infinite sum 1/3 + 2 2/3 1/3 + 3*(2/3)^2 1/...
NO
2561 Views