Top answers

Rearrange the equation y=3x+2 to make x the subject.

The most important thing to remember about rearranging equations is that what you do to one side, you have to do to the other side as well to balance it. In the question above, to get rid of the 2 on the rig...
MN
Answered by Matthew N. • Maths tutor
79839 Views

Find the derivative of the following expression: y=x^3+2x^2+6x+5.

As the expression contains 4 separate terms that are added together, we can treat this as 4 separate differentiations. The general rule for differentiation for a general term bx^n is (b n)x (n-1) . For examp...
MN
Answered by Matthew N. • Maths tutor
5351 Views

y = 6x^2 + 8x + 2. Find dy/dx

y = 6x 2 + 8x + 2 To find the first derivative of this equation, we must multiply the powers of x with the coefficient. Therefore, we do 2 times 6 (2 is the power and 6 is the coefficient) for the first term...
RD
Answered by Raj D. • Maths tutor
9521 Views

How do I know whether to add or minus in Pythagoras's theorem?

Firstly it has to be a right angled trinagle. Even if it is an irregukar shape, draw a line in to make it a right angled triangle. When you have your right angled triangle remember it is ALWAYS + if it is th...
NM
Answered by Nehemie M. • Maths tutor
42281 Views

Solve: 3(x - 2) = 21

First you look at BIDMAS, which determines the order in which functions are completed, [Brackets, Indices, Division, Multiplication, Addition, Subtraction], which says we deal with the brackets first, so we ...
MV
Answered by Mia V. • Maths tutor
21469 Views