1. ## I need help with maths please

Hi i have a problem, my exams are coming up in two months but i have no idea about maths, such questions as:
Differentiate withrespect to x

(i)
3x8

(the 8 is the small 8 that does be on the top right hand corner)

(ii)
1
- (x2-4x)
2

to be honest i have no idea, can anyone help be please,
thanks.

2. Originally Posted by dooozer
Hi i have a problem, my exams are coming up in two months but i have no idea about maths, such questions as:
Differentiate withrespect to x

(i)
3x8

(the 8 is the small 8 that does be on the top right hand corner)

(ii)
1
- (x2-4x)
2

to be honest i have no idea, can anyone help be please,
thanks.

(1) $3x^8$

$\frac{dy}{dx}=8(3)x^{8-1}=24x^7$

(2) $\frac{1}{2}(x^2-4x)$ , expand it first ..

$=\frac{1}{2}x^2-2x$

$=\frac{1}{2}(2)x^{2-1}-2$

$=x-2$

3. ## thanks

thank you, very nice,
could yu teach me some maths or is that t much to ask xxxxxxxxxxxxx

4. Originally Posted by dooozer
thank you, very nice,
could yu teach me some maths or is that t much to ask xxxxxxxxxxxxx