Top answers

Give an example of a real-world system that would be described by a quadratic equation. Explain the significance of the two real roots, a repeated root, and undefined roots. Is there any significance to a positive or a negative answer in your example?

For a ball that has been thrown, it's height above the ground can be described by a quadratic equation of the time since it was thrown and gives a parabola. The two real roots of the equation are the times w...
JB
Answered by James B. • Maths tutor
4688 Views

How can i use completing the square to factorise and solve equations

This method will only work if your x term is divisible by 2. For example x 2 + 6x + 12. You then use the halved x term (e.g. 3x) to complete the square. The beginning of your factorisation is now (x + 3) 2 ....
NS
Answered by Natalie S. • Maths tutor
5018 Views

How does Haemoglobin work?

Haemoglobin is a protein made up of 4 sub-units. Each sub-unit has a molecule of un-oxygenated Iron. Oxygen covalently bonds to the Iron and is thereby carried by the blood as Oxy-haemoglobin. Oxy-haemoglobi...
CJ
Answered by Conor J. • Biology tutor
11437 Views

Describe the difference in boiling point, colour and viscosity between the fuel oil and gasoline fractions.

The fuel oil fraction has a higher boiling point. It is also dark brown in colour while the gasoline fraction is yellow. It is also more viscous (thicker and flows less easily) due to the fuel oil molecules ...
JJ
23691 Views

How do you form the future tense in French?

The future tense is formed by taking the infinitive as the stem, and adding on the appropriate ending based on the pronoun .Firstly, we take the infinitive, in this case we will use regarder- ( to watch ) We...
SK
Answered by Simran K. • French tutor
2520 Views