Search our library of Maths A Level questions

Top answers

Maths

A Level

How would you find the coordinates of the intersections of a graph with the x and y axes, and the coordinates of any turning points?

Take the graph y = x²- 2x + 5 for example:
In order to find the intersection with the y axis, set the x values in the equation equal to 0 as this is where the graph would cross the y axi...

Answered by Simeon Y. • Maths tutor

14455 Views

y = x^3 ln x. Find dy/dx

dy/dx = u.dv/dx + v.du/dxu = x³, v = ln xdu/dx = 3x², dv/dx = 1/xdy/dx = 3x² lnx + x²

Answered by Tarun U. • Maths tutor

13625 Views

A curve has equation y = 20x −x^2 −2x^3 . The curve has a stationary point at the point M where x = −2. Find the x-coordinate of the other stationary point of the curve.

dy/dx = 20 - 2x - 6x² = -6x² - 2x + 20 which factorises to dy/dx = (10 - 6x)(2 + x). This shows that x=-2 and x=10/6=5/3 are stationary points of y = 20x −x² −2x³

Answered by Xixi Y. • Maths tutor

5779 Views

Find all values of x in the interval 0 ≤ x ≤ 2pi for 2sin(x)tan(x)=3

This questions involves the use of trigonometric identities, specifically [1] tan(x) = sin(x)/cos(x) and [2] sin²(x) + cos²(x) = 1.
Start by rearranging the given equations to ...

Answered by Jasmin C. • Maths tutor

6536 Views

Find the derivative of sin(x)/x^3 with respect to x

First, bring the x to the numerator (top) as x^(-3). Then use the chain rule: State the first times derivative of the second plus state the second times the derivative of the first.State sin(x), then mult...

Answered by Tutor170145 D. • Maths tutor

6376 Views