Find the sum of the following algebraic expressions :
`2x^(2) + 4y^(2) + 7 , - 3y^(2) + 8 , -x^(2) -2y^(2) - 2 `

Find the sum of the following algebraic expressions : 3x^(3) - 5x^(2) + 2x + 1 , 3x - 2x^(3) - x^(3) , 2x^(2) - 7x + 9

Factorize each of the following algebraic expressions: x^2-4x+4y-y^2

Separate monomials, binomials, trinomials and polynomials from the following algebraic expressions : 8 - 3x, xy^(2), 3y^(2) - 5y + 8, 9x - 3x^(2) + 15x^(3) - 7, 3x xx 5y, 3x div 5y, 2y div 7 + 3x - 7 and 4 - ax^(2) + bx + y

Find the value of each of the following algebraic expressions. 3x - 4y + 9, if x = 5 and y = -2

Find the value of each of the following algebraic expressions. 20y - 32 + 18x, for y = 3 and x = -2

Write the number of terms in each of the following algebraic expressions : 2x-:2y-7x^(2)+3

If x=1 and y=2, find the values of each of the following algebraic expressions: (i) x^2y (ii) x^2+y^2 (iii) y^2+3-x^2

Add the algebraic expressions: 4x y^2-7x^2y ,\ 12 x^2y-6x y^2,\ -3x^2y+5x y^2

Write all the terms of each of the following algebraic expressions: (i) 2x^2-7 (ii) 2x^2+y^2-3x y+4

If x=1 and y=2, find the values of each of the following algebraic expressions: (i) 3x+2y-7 (ii) x^2