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A placebo is a control method to account for perceived effects of taking a medication. This is because patients often report that they feel a difference from taking a medication, irrespective of whether i...

Firstly, we differentiate y = x²+7x+3 . This gives dy/dx = 2x+7.The minimum value occurs when dy/dx = 0. So find x and y when dy/dx=0. 2x+7=0 implies x= -3.5, which from the first equation mean...

Read the question carefully. Don't be afraid to underline keywords in the question. Often exam papers will ask you to write about themes like love, confusion, war and greed. If you see a ...

The changes in reactivity are due to the electron donating/withdrawing properties of the substituted groups. For example the OH group in Phenol is electron donating. This means the electron density of the...

First we must multiply the coefficient of x2 by the value with no x associated with it3x3 = 9Now we must find two numbers that add to make 6 and multiply to make 9+6x9 3 and 3Now we need to split the coef...