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We first notice it's a quadratic equation in x so we want to make one side of the equation equal to 0.By adding 15 to both sides we get : x² + 8x + 15 = 0We then look for two numbers which mul...

It can be so hard to identify which of all the masses of facts and figures and definitions you have learnt you need to include for a particular question, especially given the degree to which topics and th...

Throughout the history of the Earth, the climate has always been changing. This is clear from evidence of cycles of glacial advance and retreat. However the last ice age ended abruptly and this can be ass...

Completing the square is a method for rewriting a quadratic expression, and can be useful in identifying the minimum value of the expression. The aim is to end up with an expression which looks like c((x+...

In the 1920s the League of Nations was mostly successful. The League successfully adjudicated the Aaland Islands dispute in 1921, preventing a military altercation between Sweden and Finland. Furthermore,...