R S Aggarwal Solutions for Chapter: Algebraic Expressions, Exercise 3: EXERCISE 8C

If the addition of the following is $4x^2+k{y}^2-3xy-5x{y}^2$ then find $k$.

$2x^2-8xy+7y^2-8x{y}^2, 2x{y}^2+6xy-y^2+3x^2, 4y^2-xy-x^2+x{y}^2$

If the addition of the following is $x^3+y^3-k{z}^3-11xyz$ then find $k$.

$x^3+y^3-z^3+3xyz, -x^3+y^3+z^3-6xyz, x^3-y^3-z^3-8xyz$

If the addition of the following is $k{x}^3+k{x}^2+3x+1$ then find $k$.

$2+x-x^2+6x^3, -6-2x+4x^2-3x^3, 2+x^2, 3-x^3+4x-2x^2$

Subtract $-xy$ from $6xy$.

Subtract:

$3a$ from $5b$

Subtract:

$-7x$ from $9y$

If subtraction of the following is $k{x}^2$ then find $k$.

$10x^2$ from $-7x^2$

If subtraction of the following is $k{b}^2-k{a}^2$ then find $k$.

$a^2-b^2$ from $b^2-a^2$