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Factorise x^2 - 6x + 9 = 0

x 2 - 6x + 9The method for factorising quadratics is to find 2 numbers that add to make the 'x' term (-6x in this case), and multiply together to make the final term (+9 in this case). Factors of +9 are: 1x9...
KB
Answered by Kate B. • Maths tutor
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What is 64^1/2 equal to?

A number to the power of 1/2 is the same as square rooting ( √) the number, therefore 64 1/2 is equal to √64. Remember that it can be the positive or the negative square roots, so it could be 8 2 or -8 2 .
KB
Answered by Kate B. • Maths tutor
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Describe the changes that occur in the long profile and cross profile of a river valley as you move downstream.

As you move downstream from the source of a river to the mouth, a number of changes occur to the long profile and cross profile; which can be displayed in a graph plotting distance downstream against elevati...
JB
Answered by Joe B. • Geography tutor
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Explain how changing pressure affects equilibrium?

If you increase the pressure the equilibrium tries to reduce it and moves to the direction of fewer gas molecules. If you decrease the pressure, the equilibrium moves to increase it and moves where there are...
SA
Answered by Samiul A. • Chemistry tutor
2690 Views

Explain why giant ionic lattices can conduct electricity when molten or in solution rather than as a solid.

In the solid phase the ionic lattice has no mobile ions as all the ions are fixed in place. However when dissolved in a solution or in the molten phase, the ionic lattice breaks down allowing the ions to mov...
AS
Answered by Aisha S. • Chemistry tutor
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