Question

Shana used a table to multiply the polynomials 2x + y and 5x – y + 3. Her work is shown below.

 

Muriel told Shana that one of the products in the table was incorrect.

Which value in the table is incorrect?

–2y3y5xy6x

What is the value Shana should have written?

–3y–2xy–xy5x

Answer 1

Incorrect square: -2y
because
2x(-y)=-2xy

Answer 2

The value in the table which is incorrect is; -2y

The value Shana should have written is; -2xy

According to the question;

• Shana used a table to multiply the polynomials 2x + y and 5x – y + 3.
• Along the line, Muriel told Shana that one of the products in the table was incorrect

By observation, Shana commited an error while multiplying the 2x and -y term.

The correct product of 2x and -y is; -2xy as opposed to the -2y recorded by Shana.

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