Save guides, add subjects and pick up where you left off with your BBC account. Make sure you are confident in calculating with negative numbers, which is a skill often needed to solve equations. To ...

Differential equations are fundamental tools in physics: they are used to describe phenomena ranging from fluid dynamics to general relativity. But when these equations become stiff (i.e. they involve ...

Make sure you are confident in calculating with negative numbers, which is a skill often needed to solve equations. To solve the equation, do the inverse operation. The inverse of multiplying by 12 is ...