Constructing triangles and quadrilaterals from text.
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Explanation:
f(x) = x3 -2a x2 -5x +6a
if (x+2) is a factor, then f(-2) = 0
f(-2) = -8 -2a (-2)2 -5(-2) + 6a = 2 - 2a = 0
hence a = 1
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