3x + 8
-5y2+3x+2y
Factorise it: (x + 5)(3x - 8)
5x + 4
Collect like terms: 3x - x + 4x - 4y + 6y + 2 = 6x + 2y + 2
3x + 8
-5y2+3x+2y
x^2 + 3x + 2/(-3x) - x^2 - 2=3x-2+2/(-3x)=3x-2-2/(3x)
Combine like terms. 6x - 2y +7.
Factorise it: (x + 5)(3x - 8)
5x + 4
7(3y-2)-(-4y+9)
That can be factored to (3x - 5)(3x - 5) or (3x - 5)2
Collect like terms: 3x - x + 4x - 4y + 6y + 2 = 6x + 2y + 2
This quadratic expression cannot be factored because its discriminant is less than zero
You can't simplify this expression. You can calculate a value (a number) only if you happen to know how much "x" is.
I assume you wish to simplify the expression (x - 2)/(3x + 9) . (2x + 6)/(2x - 4) = (x - 2)(2x + 6) / [(3x + 9)(2x - 4)] = 2(x - 2)(x + 3) / [6(x + 3)(x - 2)] = 1/3.