Factorise 2p^2 - p = 15

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Need to thank this guy I passed my Maths GCSE. Although I didn't take the exam I watched this for help all year.

sergiosergiosergio
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Hi, Simon. was wondering how can you solve this
 
A square, with sides of length x mm, is inside a circle.

Each vertex of the square is on the circumference of the circle.

The area of the circle is 9 mm².

Work out the value of x correct to 2 significant figures.


AND this one please?


The diagram shows an equilateral triangle.

The area of the triangle is 26 mm².

Find the length of x.
(every side is x)
Round your answer to 2 significant figures.

tasweeqdrive
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Hi Simon Deacon, is it possible to go through trial and improvement questions? :)

quantusmillenius
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Is there a different method. 'Cause i did not get it

erastuskwaw