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solve X^2-x-12=0

To solve this equation we will want to first factorise the expression into two brackets, and then see what value makes each bracket 0. transform X^2-X-12=0 into (X+c)(X+d)=0We do this by finding factor pairs...
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Answered by Blake R. • Maths tutor
4304 Views

3/5 of a number is 162. Work out the number.

270
AP
Answered by Aasav P. • Maths tutor
3094 Views

Simplify fully 3/(2x + 12) - (x - 15)/(x^2 - 2x - 48)

The first step to answering this question is recognising that the denominators should be factorised to find any common factors. Factorising 3/2x+12 gives 3/2(x+6) and factorising (x-15)/(x 2 -2x-48) gives (x...
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Answered by Archie C. • Maths tutor
5751 Views

f(x) = 2x+3/x-4 Work out f ^–1 (x)

first off, replace all x values with y and all y values with x, which gives us, X = 2Y + 3 / Y - 4 rearrange to give, X(Y - 4) = 2Y + 3 expand the bracket, XY - 4X = 2Y + 3 rearrange to get all Y terms on on...
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Answered by Dean J. • Maths tutor
3084 Views

40 students were surveyed: 20 have visited France 15 have visited Spain 10 have visited both France and Spain. Use this information to complete a Venn Diagram

10 students went to both France and Spain. This means the intersection of the two circles has 10 people. Use this information to subtract 10 from the 20 that visited France and the 15 that visited Spain. The...
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Answered by Sahil S. • Maths tutor
7926 Views