5(x + 2y2)(x2 - 2xy2 + 4y4)
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seventeen over fifteen because the common denominator of 5 and 3 is 15 think about it like this: 4/5x3, 4x3=12, 5x3=15 1/3x5, 1x5=5, 3x5=15 so you get 12/15+5/15 see how they simplify back? then add the numerators and keep the denominator and you get 17/15 or 1 and 2/15
No. You can only add matrices of the same size.
Its called the product. For example, in the problem 5x3=15, 15 is the product.