40*5=200
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x2 + 13x + 40 = x2 + 5x + 8x + 40 = x(x + 5) + 8(x + 5) = (x + 8)(x + 5)
1*40 2*20 5*8
1 x 40 = 40 2 x 20 = 40 4 x 10 = 40 5 x 8 = 40
40/2 x 5 = 20 x 5 = 100
1 x 5 = 52 x 5 = 103 x 5 = 154 x 5 = 205 x 5 = 256 x 5 = 307 x 5 = 358 x 5 = 40