Algebraic Expre...

What must be subtracted from $$3x^{2}+4y^{2}-5$$ to get $$2x^{2}-3y^{2}+5$$?

Subtract $$4p^2q -  3pq + 5pq^2 - 8p - 7q - 10$$ from $$18 - 3p +  11q + 5pq - 2pq^2 + 5p^2q$$

Simplify: $$-7p-4(-3p + 2 ) $$

Simplify :$$(-8pst + 3prq -14) - (7prq - 20 + 2pst) = $$

Add the following polynomials

 If $$P = 3x -4y -8z, Q = -10y + 7x + 11z$$ and $$R = 19z - 6y + 4x$$, then $$P-Q + R$$ is equal to

$$(4px^{2}+5q^{2}y -9rz) - (-3q^{2}y + 7px^{2}-rz) = $$

Simplify :$$(-3pq^{2}+ 4pq) - (7pq - 9pq^{2}).$$

Subtract $$4x+y+2$$ from the sum of  $$3x-2y+7$$ and $$5x-3y-8$$.

Which polynomial should be subtracted from $$y^3+2y^2+5y-1$$ to get $$2y^2+12$$?