The value of this expression depends on the values of x and of y. Since you have not bothered to share that information, it is not possible to evaluate the expression.
3y2 - 2y + 6xy - 4x = y(3y - 2) + 2x(3y - 2) = (y + 2x)*(3y - 2)
Yes and x = 2+square root of 6 or x = 2-square root of 6
4x + 20
perimeter of a square is 4x square that term (4x)(4x)and it gives you 16x2
x2 - 4x - 21 = (x-7)(x+3)
6xy+9y2
xy(7+2y-3x)-6xy
3y2 - 2y + 6xy - 4x = y(3y - 2) + 2x(3y - 2) = (y + 2x)*(3y - 2)
9x2 - 6xy + y2 - 81 = (3x - y)2 - 92 = (3x - y - 9)(3x - y + 9)
4x - 2x = 2x
4
Yes and x = 2+square root of 6 or x = 2-square root of 6
x^2(2x - 3y)(4x^2 + 6xy + 9y^2)
35
3x2y - 4xy + 4x
4x - 2x = 2x
It is: x-4x = -3x