Since, x – 1/x = 15 Cubing both sides we get; x3 – 1/x3 – 3 × (x) × (1/x) × (x – 1/x) = 729 Or x3 – 1/ x3 = 1331 + 3 × 9 = 729 + 27 = 756 Alternate method: If it is given, x – 1/x = n and we have to find x3 – 1/x3, can directly use n3 + 3n. x – 1/x = 9 By using n3 + 3n, where n = 9 => 93 + 3 × 9 => 729 + 27 = 756
Potassium Permanganate is used for purifying drinking water, because it –
Which fuel has the highest calorific value?
Which of the following metals is the lightest?
Under which conditions is the volume of a gas directly proportional to the number of molecules?
Which of the following chemical substances has its formula incorrectly paired?
Itai-Itai disease is caused by exposure to which metal?
The noble gas used in radiotherapy is
Whose experiments supports Abiotic synthesis?
How many protons are present in the nucleus of an oxygen atom?
What type of sugar is maltose classified as?
