It appears to be a complex fraction. Without some grouping symbols to explain which part of the larger fraction (numerator or denominator) has the fraction in it there is no way to simplify it.
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6x - 2y + 3xz - yz = (z + 2)(3x - y) 9x - 3y = 3(3x - y) (3x - y) over (3x - y) equals 1, so they can be canceled out. The simplified expression is (z + 2) over 3.
y=2x2+5. Plug in 0 for x, and you get y=2(0)^2 +5 =0+5=5. 5 is the minimum value for y.
(x)(x+y) ....or..... x2+xy
If that's y2, the answer is (y - 5)(y + 3)
2 * 2 * 5 * x * y