Search over 10,000 free study notes

2x + y = 18x - y = 6. There are a few methods you can use to tackle simultaneous equations. The one I find the easiest is making one of the unknowns a subject and plugging it back into the other equ...

Completing the square is a method of solving quadratic equations that can't be factorised. The end goal is to express the quadratic in the form:(x + a)² = -bWhich allows us to root both sides a...

The first step would be to rearrange the first equation to make y the subject:
3x+y=-4 ----> y=-4-3x
Next we want to substitute this value of y into the second equation
3x-4y=6 ----->...

When these atoms react together Calcium chloride, CaCl₂, is formed. Calcium atoms have two electrons in their outer shell, which can be determined from the fact they are in group 2 of the perio...

The perfect tense is used in French to described completed actions in the past, such as 'I ate an apple' or 'I have done my homework' .e.g. Je mange une pomme = I eat an apple (present tense) // J'ai mang...