Given that ABCD is a trapezoid (AB ∥ DC), AD = BD = CD = 6.5cm and BC = 5cm. Find the length of the diagonal
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A. Judy made a mistake between Steps 1 and 2
To factor
, you have to factor it as 
, not 
, because that will leave an extra 6x because of 8x - 2x.
To factor
