Simplify and find the value of the simplified expression when x=-1 and y=2.
`4(x^2+3y^2)-(9xy-[5(2x^3-3y^2)+xy)]`

Simplify and find the value of the simplified expression when x=-1 and y=2. 3(2x^2-4y^2)- [7xy-[3(x^3-2y^2)-2xy)]

Simplify these expressions and find their values if x=3, a-1 and b=-2 (i) 3x-5-x+9

Simplify the following expression: x^2(1-3y^2)+x(x y^2-2x)-3y(y-4x^2y)

Add x^2+y^2+3xy-6 and 2x^2-4y^2-xy+5

If 2x+3y=8 and x y=2 , find the value of 4x^2+9y^2

When x=4 and y=2 find the value of : x^(2)-2xy+y^(2)

Simplify: (x+y)^3-(x-y)^3-6y(x^2-y^2)

Simplify each of the following algebraic expressions by removing grouping symbols. 5a-(3b-2a+4c)\ -2(x^2-y^2+x y)-3(x^2+y^2-x y)

Simplify each of the following algebraic expressions by removing grouping symbols. 1. 2x+(5x-3y) 2. 3x-(y-2x)

Find x and y when (7x-2y)/(xy)=5 (8x+7y)/(xy)=15