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Using Discriminants to Find the Number of Roots of a Quadratic Curve

In general, we could apply the formula to work out the solutions of a quadratic function ax 2 +bx+c=0. The b 2 -4ac part is called the discriminant and the value of a discriminant could allow us to know the ...
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Answered by Angela L. • Maths tutor
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How to find conditional probability

Take this problem as an example: 5 white socks and 3 black socks are in a drawer. Stefan takes out two socks at random. Work out the probability that Stefan takes out two socks of the same colour without rep...
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Answered by Joseph U. • Maths tutor
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Uranium -238 has a half life of 4.5 billion years. How long will it take a 2g sample of U-238 to contain just 0.4g of U-238?

Radioactive decay is a process where the nucleus of an unstable atom, such as Uranium-238 loses energy by emitting radiation. The half life is the average time it take for half the nuclei in a sample to unde...
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Answered by Robert E. • Physics tutor
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Is the British Prime Minister become Presidential?

While critics seem to be regularly telling us that we are moving towards a more Americanized system characterized by a growth in spatial leadership (the presentation of the party leader as the 'relatable out...
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How are the human lungs specialised for gas exchange?

Gas exchange is when oxygen is transferred from the air in the lungs to the blood and carbon dioxide is transferred from the blood to the air in the lungs. It occurs in the alveoli of the lungs.The lungs hav...
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Answered by Anna D. • Biology tutor
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