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.
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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)