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Expand and simplify (x − 4)(2x + 3y)^2

Answer: 4x³ + 12x²y + 9xy² - 16x² - 48xy - 36y²

Answered by Daisy H. • Maths tutor

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How do I solve simultaneous equations? eg 1) 4x = 16 - 2y and 2) 3x + y = 9

The straight line L1 passes through the points with coordinates (4, 6) and (12, 2) The straight line L2 passes through the origin and has gradient -3. The lines L1 and L2 intersect at point P. Find the coordinates of P.

make y the subject of this expression p = ((x+y)/5)^1/2

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