(10x-1)(x-10)
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10x2 + 101x + 10 = (10x + 1)(x + 10)
10 + 10 + 10 + 10 + 10 + 10 + 10 + 108 = 178
x2 + 8x - 20 = (x - 2)(x + 10).
The factors are [3x + 5 - 2*sqrt(10)] and [3x 5 + 2*sqrt(10)].
One method is (10×4)+(5×3) = 55 (or mentally add up from left to right).