Search our library of Maths questions

Top answers

Maths

All levels

A curve C has the equation y=5sin3x + 2cos3x, find the equation of the tangent to the curve at the point (0,2)

Firstly, you need to differentiate the curve y. Using the equation dy/dx of sinkx= kcoskx, you need to differentiate 5sin3x first. So, as k=3 in this example, the answer is 5(3cos3x) which is equal to 15c...

Answered by • Maths tutor

4325 Views

If x^2 + 4x + 3xy + y^3 = 6, find the first derivative.

This is an example of implicit differentiation. We differentiate with respect to x, remembering that y is a function of x. The terms without a 'y' differentiate as normal by the power rule nx^n-1

Answered by Tutor461339 D. • Maths tutor

3240 Views

Rob has a bag with white, black and blue counters. There are twice as many blue counters than there are white. A qaurter of all the counters are black. If there are 5 white counters, how many counters are in the bag.

White:blue is 1:2. (There are twice as many blue counters)if there are 5 white counters there are 10 blue counterswhite + blue = 15in the bag there are the 15 white and blue counters PLUS the blacki.e. In...

Answered by Aurimas K. • Maths tutor

3524 Views

In a right-angled triangle calculate the length of the hypotenuse when the side lengths at 5cm and 7cm. Leave your answer as a surd.

Using pythagoras’ theorem:a^2 + b^2 = c^2
hypotenuse = sqrt(5^2 + 7^2) = sqrt(25+49) = sqrt(74)

Answered by • Maths tutor

3046 Views

Solve the equation x^2 + 10x + 24 = 0

So, we are dealing here with a quadratic equation as it is written in the form ax^2 + bx +c = 0 To tackle this we will firstly need to factorise the equation, we need to find two numbers that will multipl...

Answered by Aleema S. • Maths tutor

2790 Views