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Find the inverse of y = (5x-4) / (2x+3)

the aim of finsing the inverse is making x the subject. To start we need to multiply both sides by: (2x+3), giving us: y(2x+3) = 5x-4 now we need to expand the brackets: 2xy +3y = 5x-4 now gather all the x c...
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Answered by Xuanyi A. • Maths tutor
6466 Views

Why is (-1)*(-1)=1?

Even though this question seems trivial to most people with some mathematical expertise, it actually cuts quite deep into an intuitive understanding of what multiplication truly is. When one writes an expres...
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Answered by Rudolfs T. • Maths tutor
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Write 120 as a product of its prime factors.

120 2 x 60 2 x 30 2 x 15 3 x 5 Ans= 2 3 x 3 x 5
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Answered by Edward L. • Maths tutor
52918 Views

Work out the points of intersection of the graphs of y= (x+2)(x-4) and y=3x+6.

3x+6=(x+2)(x-4) 3x+6 = x 2 -2x-8 x 2 -5x-14=0 (x-7)(x+2)=0 x=7 so y=27 and x=-2 so y=0
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Answered by Edward L. • Maths tutor
5349 Views

In a lottery, 6 numbered balls are drawn from a pool of 59. Calculate the probability of scoring a jackpot. There used to be 49 balls in the pool. Calculate by how much the addition of 10 balls has decreased the probability of scoring a jackpot

The question has to do with probability, and the branch of mathematics which models such situations is called probability theory. A jackpot is, of course, when we correctly predict all the numbers on the bal...
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Answered by Marcin M. • Maths tutor
13466 Views