Top answers

How do I know which rule of trigonometry to apply in a question?

There are four trigonometry rules which you need to know: Pythagoras, SohCahToa, the cosine rule and the sine rule. The first two only work on right angle triangles, and the second two apply to non-right ang...
SP
Answered by Seb P. • Maths tutor
9040 Views

Find the values of X and Y from the simultaneous equations: 1) 2x + 5y = 33 2) x + 3y = 19

2x + 5y = 33 2) x + 3y = 19 multiply equation 2 by a factor of 2 giving you 2x + 6y = 38 Your two equation are now: 1) 2x + 5y = 33 3) 2x + 6y = 38 Subtract 3 from 1 to eliminate the x's Giving you Y = 5 Now...
CC
Answered by Chris C. • Maths tutor
3834 Views

What is the method to solve an equation of type : ax^2+bx+c = 0 ?

This kind of equation is called a quadratic or a polynomial of degree 2.The goal when faced with a quadratic is to solve it as fast as possible. We do this in two steps. First, we check if there is an easy w...
AV
Answered by Antoine V. • Maths tutor
5550 Views

Simplify fully (x^2 + 3x)/(4x + 12) ​

First, factorise both the top and the bottom expressions. What is the common factor for the top expression? (expect an answer of x). If you factorise out the x, what are you left with? (expect x(x+3))What is...
MP
Answered by Martha P. • Maths tutor
3874 Views

Work out 51% of 400

0.51x400 =204
RN
Answered by Rachel N. • Maths tutor
5021 Views