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Maths
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Find the equation of the tangent to the curve y = 2x^2 + x - 1 at the point where x = 1.

To get the required tangent equation we need its gradient and the coordinates of a point it passes through. We can then substitute it into the formula y - y1 = m(x - x1). 1. ...

BT
Answered by Beth T. • Maths tutor
11550 Views

When do you know to use integration by parts?

You use integration by parts if there's more than one function of x. For example; to integrate xsin(x) you'd use integration by parts as this is two functions of x. The formula to remember is I(udv) =...

NL
Answered by Natasha L. • Maths tutor
3979 Views

Rearrange to make p the subject. C + 5 p = a ( C – p )

C+5p = a (c-p)

C+5p = ac-ap

5p+ap=ac-c

p(5+a) = c(a-1)

p=(c(a-1))/(5+a)

SM
Answered by Santiago M. • Maths tutor
4303 Views

x is an integer such that ‎1≤x≤9, Prove that 0.(0x)recurring=x/99

r=0.0.x.

r=0.0x0x0x0x....

100r=x.0x0x0x     (1)

10,000r=x0x.0x0x0x      (2)

(2) - (1):  9,900r=x00

EE
Answered by Ellie E. • Maths tutor
13433 Views

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