A 7*2 matrix (not matrice) and a 2*6 matrix, if multiplied together, will from a 7*6 matrix.
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7x2 plus 7x5 = 49
7x2 + 68xy - 20y2
7x2- 63 = -35, when x equals 2
I suppose you mean, how do you factor it. 7x2 - 9x - 10 = (7x + 5)(x - 2).
7x2