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Solve x2 + 2x − 4 = 0 leave in simplest form.

This is a Quadratic equation so you would try to factorise.If it was on the calculator paper use the equation (You don't need to memories this equation, but you have to be commutable using it).However this i...
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Answered by Malee N. • Maths tutor
5275 Views

Explain the differences between the 'passé composé' and the 'imparfait', and the circumstances in which each tense would normally be used.

In French, the 'passé composé' is used to describe actions which have already been completed in the past (which have finished). These include events which have only occurred one time ( je suis né /j' ai comm...
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Answered by Jake S. • French tutor
2432 Views

Explain, with reference to the electronic transitions involved, how characteristic flame colours of metal ions are formed and why the flame colours are different.

To answer this we need to talk about how electrons move in an atom. Electrons are in energy levels (orbitals) and an electron in the highest unoccupied orbital can be excited to a higher shell when given eno...
IK
Answered by Isabel K. • Chemistry tutor
5402 Views

2x + y = 10 and 4y - 5x = 1, solve for x and y.

Rearrange one of the linear equations in order to have x or y written as an equation of the other. I.E 1) y =10 - 2x.Then substitute this value into the other equation: 4(10 - 2x) - 5x = 1, hence 39 = 13x wh...
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Answered by Nathan T. • Maths tutor
4874 Views

Solve the equation 3^(2x+1)=1000

We can use logarithms with base 3 to solve this equation.2x+1=log 3 10002x=log 3 (1000)-1x=0.5(log 3 (1000)-1)x=2.64
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Answered by Samuel D. • Maths tutor
5536 Views