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Solve x^2 = 4(x – 3)^2

To solve this equation we need to firast expand it. x 2 =4(x-3) 2 To do this we first expand the brackets. Remeber anything squared means times it by itself (x-3) 2 =(x-3)(x-3) =x 2 -6x+9 This makes the equa...
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Answered by Annabel M. • Maths tutor
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With reference to valencies, describe and explain the differences in reaction as you go down group 1 of the periodic table for the reaction: metal + water -> Metal hydroxide + hydrogen.

As you descend the group, the reactions become more vigorous, more exothermic and have a higher rate of reaction. Lithium will just gently fizz and produce a gas, sodium will melt into a ball shape and fizz ...
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Answered by George N. • Chemistry tutor
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What is meant by дательный падеж and what is an example of where it is used?

The dative case. This is a case used for indicating movement towards something, e.g. in the sentence 'give the book to me' the word 'me' takes the dative case. The word мне thus means 'to me'.
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Answered by Anna H. • Russian tutor
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how do you factorise a quadratic where there is a number in front of the x squared?

All quadratic equations have the form ax 2 + bx + c. If you take the equation: 2x 2 + 4x + 2 In this example a=2, b=3 and c=2 In order to factorise what we call a number (coefficient) higher than 1 in front ...
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Answered by Sagar M. • Maths tutor
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How do I Structure my essays?

when structuring your essay it is at first Key to what I call, "figure the riddle" in the question, this is perhaps more important at A-level than it is at GCSE but it is important none the less. A...
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Answered by Oscar P. • History tutor
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