Search our library of Maths questions

Top answers

Maths

All levels

What is the equation of the tangent to the circle (x-5)^2+(y-3)^2=9 at the points of intersection of the circle with the line 2x-y-1=0

Teh points of intersection can be found by subbing in y=2x-1 to the equation of the circle. (x-5)²+(2x-1-3)²=5x²-26x+33=9 so we have 5x²-26x+24=0. Solving the q...

Answered by Tutor67416 D. • Maths tutor

3500 Views

When do I use the product rule as opposed to the chain rule?

The product rule is used when two functions of x are multiplied by each other, hence, product. So this can be used to differnetiatate 3x²* x+1 or more complex functions like sinxcosx.

Th...

Answered by Lota U. • Maths tutor

3938 Views

Let f (x) = sin(x-1) , 0 ≤ x ≤ 2 π + 1 , Find the volume of the solid formed when the region bounded by y =ƒ( x) , and the lines x = 0 , y = 0 and y = 1 is rotated by 2π about the y-axis.

Draw a rough sketch of the graph of f(x) = sin(x-1) to get an idea of what the region looks like. Realise that the normal volume of revolution for the area between x axis and the f(x) is given by V = pi* ...

Answered by Ankur S. • Maths tutor

7173 Views

Solve these simultaneous equations. x^2+y^2=9, x-y+3=0

Rearrage so you have x+3=y, and x²+y²=9. Substitute the equation into another so you have x²+(x+3)²=9. Expand the brackets so that you have x²+x

Answered by Adam B. • Maths tutor

6096 Views

A line runs between point A(5,9) and B(11,1). Find the equation of the line. Point C lies on the line between A and B. The line with equation 2y=3x+12 also crosses through point C. Find the x coordinate of Point C.

For the first part it would be a good idea to sketch out the graph. Then using the formula 'change in y/change in x' find the gradient of the line (-4/3). You can then either use the formula y=mx+c and pu...

Answered by Amelia T. • Maths tutor

3075 Views