Top answers

What is the plus-que-parfait and when do you use it?

First of all, these more complex tenses are often very complicated and difficult so do not feel discouraged if you do not understand them initially, but once you do you will be using the plus question parfai...
EL
Answered by Ella L. • French tutor
5002 Views

use the substitution u=2+ln(x) to show that int(e,1(ln(x)/x(2+ln(x)^2))dx)=p+ln(q) , where p and q are rational numbers.

So u=2+lnx, therefore du/dx=1/x , we can work out the new upper and new lower limit by substitute in e and 1 into 2+lnx , and we get 2+ln(e)=3 , 2+ln(1)=2Rearrange the differential we get dx=xdu , substitute...
Answered by • Maths tutor
5687 Views

Solve the quadratic inequality: x^2 - 5x + 4 < 0

x 2 -5x+4 &lt;0First we ignore the inequality and try to solve the equation x 2 -5x+4=0, which we do via factorising (x-4)(x-1)=0. x = 4 or x=1We draw the graph using our solution, going through the points o...
HH
Answered by Hariz H. • Maths tutor
13805 Views

Solve the following simultaneous equations to find x and y.

2x 2 - 2y = 282y - 4 = 12x y - 2 = 6xy = 6x + 2 Substitute y = 6x + 2 2x 2 - 2(6x + 2) = 282x 2 - 12x - 4 = 282(x 2 - 6x - 2) = 28x 2 - 6x - 2 = 14x 2 - 6x - 16 = 0(x - 8)(x + 2) = 0 if x = 8 then y = 50if x...
PD
Answered by Prahlad D. • Maths tutor
3596 Views

What is the electron figuration of a copper ion? The n what is the electron configuration of a copper2+ ion

The electron configuration is:{Ar]4s13d10Copper donates one of the electrons in its S orbital to the d orbital in order to make itself more stableCopper 2+ is [Ar]3d9The 4s electrons are lost first as they a...
Answered by • Chemistry tutor
3176 Views