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Expand the following brackets, (6x^2-4)(2x+3)

12x 3 +18x 2 -8x-12
SP
Answered by Sophie P. • Maths tutor
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Work out 70% of 140 (Non-calculator)

70% of 140 can be split up into 50% of 140 and 2 lots of 10% of 140. 50% of 140 is the same as 140 divided by 2, which equals 70. 10% of 140 is the same as 140 divided by 10, which gives 14. Therefore 70 + 1...
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Answered by Jake P. • Maths tutor
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Factorise x^2 - 7x + 12 = 0

Method 1) Find two numbers which multiply to 12, and who’s sum is -7. ( This could be done by writing out the factors of 12, and seeing which add to -7.) From doing this we get -3 and -4, therefore our answe...
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Answered by Rachel S. • Maths tutor
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Solve 4(x-5)=3x-6

First, expand brackets to make your life easy. So you would do 4 times x and 4 times -5 to give u 4x-20. Then gather all the x's on one side of the equation and numbers on the other side. 4x-20=3x-6. Remembe...
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Answered by Aymen S. • Maths tutor
5444 Views

There are a collection of CDs. There are 2 Rock CDs, x Pop CDs and 2x + 5 Jazz CDs. A CD is chosen at random, the probability that it is Rock is 1/20. Work out the probability it is Jazz.

To answer this question first we need to work out how many CDs we have in total. We do this by adding up the number of CDs in each category:Total = 2 + x + 2x + 5. We can simplify this to give:Total = 3x + 7...
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Answered by James M. • Maths tutor
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