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Maths
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Solve 6x^2+8x-8 = 0 using factorisation.

Factorise using a suitable method (eg product and sum) to find (6x-4)(x+2) = 0Hence x = 4/6 and x = -2.

MS
Answered by Matthew S. • Maths tutor
2997 Views

There are 35 people in a group. x(x+1) of them have a blue car, 5x of them have a red car, 4 have a blue and a red car and 4x-8 do not have car. Work out the probability that a person who has a blue car, has a red car as well.

We see this question is about conditional probability. Because a person chosen at random from the group satisfies a 1st condition: they have a blue car. And after we know this, they have to satisfy a 2nd ...

AP
Answered by Ana P. • Maths tutor
2332 Views

How can you add and subtract fractions with surds in them?

The square root sign can make fractions look a bit scary until you're familiar with it, that's the same with anything new! The important thing to remember is, the rules of algebra are the same

DH
Answered by Daisy H. • Maths tutor
7278 Views

differentiate parametrically y=3t+4 and x=2t^2 +3t-5

first you differentiate both equations giving dy/dt = 3 and dx/dt = 4t+3
dividing dy/dt by dx/dt gives dy/dx and so the answer is 3/(4t+3)

Answered by • Maths tutor
3051 Views

what is the point of intersection between the lines 3y-4x=12 and 2x=2y+3

As these are simultaneous equations you will need to get a coefficient of either x or y on one side and then substitute it within the other equation. Using the second equation you can divide by 2 leading ...

BG
Answered by Benedict G. • Maths tutor
2462 Views

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