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We must choose something to multiply the numerator and denominator of the fraction by the same thing, and the best thing to choose is the difference of two squares (since (x^2-y)(x^2+y)=x^2-y^2 ).
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The distinction between positive and negative notions of freedom can be traced to Isaiah Berlin and his 1936 essay: "Two Concepts of Liberty". Negative freedom is defined as freedom from obstacl...

Immobilised enzymes are enzymes that have been trapped into an inert matrix or material (such as calcium alginate) which prevents them from moving during the reaction process. Whole cells such as yeast an...

Think about it as 'What numbers can be x to get 4'. Remember that when you square a number the answer is always positive? Here is a situation in which it's important to consider both of the possible solut...

Before heating: Ice and air present in the tin, the ice particles vibrate about fixed positions, they do not exert a pressure on the lid at this time, air particles inside the tin hit the lid but exert th...