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To work out the number of roots a qudratic ax²​+bx+c=0 you need to compute the discriminant (b²​-4ac).

If the discrimant is less than 0, then the quadratic has no re...

The area of a triangle is the (1/2) x (base x the height).

The main methods of differentiation you need to know at A level are the chain rule, the product rule and the quotient rule.

The chain rule should be used when the eqation is a function of...

Used for right angled triangles where c is the hypothenuse and a and b are the two other sides.

Equation: a² + b² = c²

Label the sides of th...

To solve the equation means to make x the subject i.e. to make x on its own. Therefore, we need to add 6. If you add 6 to one side you must also add 6 to the other side. 

x-6+6 = 15+6