Write an algebraic expression to show the area of a square with side length x+4

x2 + 8x + 16

AB

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Solve these simultaneous equations 5x + y = 21, x- 3y = 9


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


Sketching a quadratic


A ladder of length 3.5m rests against a vertical wall and makes an angle of 40* with the floor. How far up the wall does top of the ladder reach?