Maths-
General
Easy

Question

Simplify: (x + y)(2x + y) + (x + 2y)(x – y)

hintHint:

  • Multiplication of polynomials.
  • Follow three steps while multiplication of polynomials.
First, multiply each term in one polynomial by each term in the other polynomial using the distributive law.
Add the powers of the same variables using the exponent rule.
Then, simplify the resulting polynomial by adding or subtracting the like term

The correct answer is: 3x2 - y2 + 4xy


    • Step-by-step explanation:
    ○        Given:

                           (x + y)(2x + y) + (x + 2y)(x – y)
    ○        Step 1:

                          (x + y)(2x + y) + (x + 2y)(x – y)

                         rightwards double arrow x(2x + y) + y(2x + y) + x(x - y) + 2y(x - y)

                         rightwards double arrow2x2 + xy + 2xy + y2. + x2 - xy + 2xy - 2y2 .
    ○        Step 2:
    ○        Group like terms:

                          2x2 + x2 + y2.- 2y2  - xy + 2xy + xy + 2xy

                          rightwards double arrow space space3x2 - y2 + 4xy

    • Final Answer:

                         3x2 - y2 + 4xy

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