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How do I solve a quadratic equation by completing the square?

The first step is to make sure that the coefficient of x^2 is 1 by dividing all terms by a (where a equals the coefficient of x^2). Then we must write the quadratic equation as a square plus another term. To...
GJ
Answered by Gina J. • Maths tutor
4987 Views

Why is sucrose digested faster than starch?

Sucrose is digested faster than starch because the process only has one step: sucrose is digested to glucose by sucrase. However, the digestion of starch has two steps: starch is digested to maltose by amyla...
XQ
Answered by Xinyi Q. • Biology tutor
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When chlorine is bubbled through potassium bromide solution, the solution turns orange. Explain this.

This is because the reaction taking place is a displacement reaction , meaning that one element is being displaced by another. So what is being displaced?: If you look at the periodic table, chlorine is more...
LB
Answered by Leah B. • Chemistry tutor
89172 Views

How do I find the half-life of radioactive isotope?

The half-life of a radioactive isotope is the time taken for half of the atoms in a given sample of the isotope to decay. Radioactivity is random and so, half-life is the average time taken for a large numbe...
JS
Answered by Joe S. • Physics tutor
18541 Views

How do you take the derivative of a^x ?

There are two ways you can take the derivative of a^x. 1) Let y = a^x now we're trying to find dy/dx 2) ln(y) = xln(a) take logs of both sides and use log rules 3) (dy/dx)*(1/y) = ln(a) take the derivative o...
SG
Answered by Sam G. • Maths tutor
7126 Views