4x2 + 12x + 5 = 4x2 + 2x + 10x + 5 = 2x(2x+1) + 5(2x+1) = (2x+1)(2x+5)
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4x2 + 12x + 5 = (2x + 1)(2x + 5).
x2+12x+5 = 3 x2+12x+5-3 = 0 x2+12x+2 = 0
16X + 5
12x + 5 - 2x =(12x - 2x) + 5 =10x + 5 =5 (2x + 1)
-5 + 12x = 18x + 7Subtract 7 from each side:-12 + 12x = 18xSubtract 12x from each side:-12 = 6xDivide each side by 6:-2 = x