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Maths
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When should I use the quadratic formula?

If you're asked to solve a quadratic equation, you could factorise it, or you could use the quadratic formula. The quickest way is to factorise, but sometimes the numbers are too tricky to factorise, (...

SM
Answered by Sarah M. Maths tutor
3318 Views

A right-angled triangle has base 10cm and height 4cm. What is the area of the triangle?

The first thing we should note here is that we are looking for the area, so we need to recall the formula for the area of a right-angled triangle:

Area = (base x height) / 2

KS
Answered by Kirsty S. Maths tutor
12826 Views

Use the chain rule to differentiate y=(x-3)^(-3)

Hint: the chain rule states that for y=u(x) ^a, the derivative will be dy/dx = dy/du * du/dxSo we just need to find dy/du and du/dx!In this case u(x)=x-3, so du/dx = 1.from y=u^(-3), dy/du = -3u^(-4).This...

RT
Answered by Rosemary T. Maths tutor
5198 Views

Solve the inequality x < 4 - |2x + 1|.

In order to deal with the modulus sign, we must take account of 2 possible cases:

Case 1: |2x + 1| = (2x +1). In this case we can solve algebraicly, preserving the inequality sign, to get...

JC
Answered by Joe C. Maths tutor
7923 Views

Find the exact value of the gradient of the curve y = e^(2- x)ln(3x- 2). at the point on the curve where x = 2.

To solve this problem, we must first differentiate:

Identify that we are able to use the product rule as our expression is of the form y = f(x)g(x) where f(x) = e^(2- x) and g(x) = ln(3x-...

JC
Answered by Joe C. Maths tutor
9969 Views

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