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Prerequisite for addition formula: https://www.youtube.com/watch?v=iHZmi2MHqWc

Proof of formula for sin(A+B): https://www.youtube.com/watch?v=BEETggUVMrY

Proof of formula for cos(A...

Answered by Sam G. • Maths tutor

5405 Views

How do I know how many roots a quadratic equation has?

Let ax² + bx + c = 0 be the equation in question where a,b,c are real numbers with a not equal to 0 (otherwise we would not have a quadratic).

If:

Answered by Amit G. • Maths tutor

9718 Views

How do you differentiate (3x+cos(x))(2+4sin(3x))?

Here we have a product of two things, so we will be using the product rule of differentiation. This is: for y=u(x)v(x), where u(x) and v(x) are funtions of x, dy/dx = u'(x)v(x) + u(x)v'(x). So in this ...

Answered by Jaisal P. • Maths tutor

5672 Views

Given that 346 × 27 = 9342 , work out 34.6 × 2.7

Lets compare the numbers in the question:
34.6 x 2.7 is the same as 346/10 x 27/10 (decimal to fraction)

therefore...
34.6 x 2.7 is the same as ( 346 x 27 ) /100 (multiplying to...

Answered by Andrew W. • Maths tutor

7428 Views

Factorise x² + 10x + 16

This is a quadratic equation.
When we are asked to facorise a quadratic equation, we should label the 3 parts of it a, b and c.

x² + 10x + 16
a b c so a =...

Answered by Andrew W. • Maths tutor

68188 Views