3/4 + 1/7 = 3/4 x 7/7 + 1/7 x 4/4 = 21/28 + 4/28 = 25 /28
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Negative plus a negative is a negative. Ex. -1+-1=-2 Negative times a negative is a positive. -2*-2=4 But a negative [minus] plus a positive [plus] can be minus, zero or plus: For example, -3 + 2 = -1 -3 + 3 = 0 -3 + 4 = +1
3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (4) = 3n + 6
3x2 + 2x + 3 + x2 + x + 1 = 4x 2+ 3x + 4
(7-3)^2 plus (7-1)^2 = 16+36
(4x + 1)(2x + 3)