4x2-8x-5
(2x+1)(2x-5)
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4a2 - 9a + 5 = 4a2 - 4a -5a + 5 = 4a(a - 1) - 5(a - 1) = (4a - 5)(a - 1)
8a-3b = 5
2a3-16a2+30a Factor out 2a: 2a(a2-8a+15) (2a)(a-5)(a-3) This is the most factored form of this expression.
12(8a + 28) + 2a + 5 84a + 336 + 2a + 5 86a + 341
If 8a = 40 then a must = 5So: 2*5-4 = 6