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12x³ +18x²-8x-12

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 ...

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 an...

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. Reme...

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 ...