4x2 is 8+ 12x + 3 collect like terms, 8+3= 11, 12x+11 to solve for x, transpose the 11 to the other side of the = sign, 12x=-11, divide by 12, x=-11/12
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4x2 + 12x + 5 = (2x + 1)(2x + 5).
Only if the value of c is 9 because:- 4x2+12x+9 = (2x+3)(2x+3)
4x2+12x = 4x(x+3) when factored
4x2 + 12x + 5 = 4x2 + 2x + 10x + 5 = 2x(2x+1) + 5(2x+1) = (2x+1)(2x+5)
4(x + 2)(x + 1)