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Find the value of (81)^(-1/2)

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Answered by Ben H. • Maths tutor

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Find the centre and radius of the circle with equation: x^2 + y^2 -4x +8y = 5, and determine whether the point (7,-4) lies on the circle.

6x-2y=33 4x+3y=9

Solve x^2 + 7x + 6 = 0

Solve by factorisation: 2(x^2) - 5x - 12 = 0

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