x2 +4x+3 is a polynomial that can be factored. It is the same as (x+1)(x+3). If we want to solve x2 +4x+3=0, then the factored form tells us x=-1 and x=-3 are the solutions. This is because if you have AB=0 and A and B are numbers or algebraic expressions, either A or B or both are 0. So x+1=0 implies x=-1.
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4x + 3 doesn't factor. It is in its simplest form.
y = 4x-3
x2 + 4x + 3 =(x + 3) (x + 1)
If the equasion is 12x+6-8x-4x-3+12 then the answer is 15.
The solution of 4x plus 3y -9 and x -3 is; 5x+3y-3.