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Factorise x^2-25

=(x-5)(x+5)

Answered by Urja P. • Maths tutor

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Jorgen has 20 sweets in his pocket. The sweets are either blue or yellow. He picks a sweet and eats it and takes another sweet and eats it again. The probability of him picking two blue sweets is 6/30. How many yellow sweets does he have in his pocket.

Solve simultaneously x + y = 1, 2x + 3y =9

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Solve (5-x)/2= 2x-7

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