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Sine Rule

The sine rule is a very powerful tool used in mathematics to calculate unknown sides and angles of triangles when we only know some of the information. For example if we have a triangle and we know two angle...
HG
Answered by Hugo G. • Maths tutor
6026 Views

I can't figure out this question to do with VAT. VAT is charged at 20%. A TV is for sale for £650 inc. VAT in Good Electronics and the same TV is for sale £495 exc. VAT in Wright's Electricals, where is it cheaper?

I can't figure out this question to do with VAT. VAT is charged at 20%. A TV is for sale for £650 inc. VAT in Good Electronics and the same TV is for sale £495 exc. VAT in Wright's Electricals, where is it c...
WH
Answered by William H. • Maths tutor
5883 Views

I'm supposed to calculate the differential of f(x)= sin(x)*ln(x)*(x-4)^2 using the product rule. I know what the product rule is but I can't split this into two bits that are easy to differentiate. How do I do it?

You say you are familiar with the product rule i.e. f(x)=u(x)v(x) f'(x)= u(x)v'(x)+v(x)u'(x) (Equation 1) OK so why don't we try applying that here let's try splitting the function in this problem down into ...
WH
Answered by William H. • Maths tutor
4671 Views

Solve 9x-4=7(x+2)

BIDMAS is used to determine the first step in solving this problem. The bracket on the right hand side is expanded first. 9x-4=7x+14. Now the x's and numbers must be moved to opposite sides of the equals sig...
JT
Answered by Jayani T. • Maths tutor
7131 Views

How do you form a Cartesian equation from two parametric equations?

If the two parametric equations have the form x = a t + b and y = c t + d then the first step is to rearrange one to make the parameter 't' the subject. We then substitute this equation for 't' into the othe...
AL
Answered by Alexander L. • Maths tutor
18892 Views