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To factorize this you need to find two numbers that have a sum of -1 and a product of -12. Start y finding the pairs of numbers the times to make -12; (-1,12), (-2,6), (-3,4), (1,-12), (3,-4), (2,-6). Nex...

The three trigonometric functions sine, cosine, and tangent are derived from looking at the ratios of side lengths in a right-angled triangle. (Triangle drawn and side lengths annotated H=hypotenuse, A=ad...

Normally, when you're using the perfect tense with 'avoir' as an auxiliary verb, the past participle doesn't change to agree with anything. However, there are three main situations where the form of the p...

When I say agreement, I mean the addition of an 'e' (for gender) and/or an 's' (for number) to the past participle so that it corresponds with the subject or object of the verb. For all verbs that take êt...

Firstly I check that the equation is of the form ax² +bx+c=0 , here it is in such form as a=3 b=-1 c=-10. Because it is a quadratic equation, it can be factorised into 2 brackets. In each brack...