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(2x + 3y)^2 – (2x – 3y)^2 = 360 show that xy is a multiple of 5

Expand first brackets:

4x²+6xy+6xy+9y²

Expand second brackets:

4xy²-6xy-6xy+9y²

Subtract the second e...

Answered by Ryan M. • Maths tutor

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Where is DNA found in a human cell? What is a gene?

DNA is a long molecule found in the nucleus (or more specifically the nucleolus) of a human cell. When it is condensed and shortened it appears, under a microscope,

Answered by Ryan M. • Biology tutor

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How do I analyse a text to A or A* level?

The examiners are looking for two things from your analysis of a text. Firstly, they want to know that you can identify literary techniques when they are used by the author. Literary techniques dont ha...

Answered by Ramganesh L. • English tutor

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Solve the simultaneous equations 5x + 3y = 24 and 3x - 4y = 26

Ok, so here are the equations5x+3y=243x-4y=26So let's multiply the first equation by 3, which gives us:15x+9y=72Now let's multiply the second equation by 5, which gives us:15x-20y=130So we're now left wit...

Answered by William S. • Maths tutor

12116 Views

How do I solve x^2+6x+8=0?

Ok, so we would call this a quadratic equation because it is written in the form of ax^2+bx+c=0 (in our case, a=1, b=6, c=8).Luckily, this type of quadratic equation can be factorised, so we can solve it ...

Answered by William S. • Maths tutor

17737 Views