Middle Years

A student incorrectly used the distributive property and wrote $6\left(7x+2\right)=42x+2$6(7`x`+2)=42`x`+2.

Which of the following is the best explanation to help the student correct their error?

They have have multiplied the wrong term in the sum by $6$6. They should multiply $2$2, instead of $7x$7`x`, by $6$6.

A

They have forgotten to multiply the second part of the sum, $2$2, by the number outside the brackets, $6$6.

B

They have multiplied $7x$7`x` and $6$6 rather than adding them.

C

They have added $7x$7`x` and $6$6 rather than multiplying them.

D

Easy

Less than a minute

Expand the expression $5\left(s+7\right)$5(`s`+7).

Expand the expression $9\left(5+w\right)$9(5+`w`).

Expand the expression $3\left(r-6\right)$3(`r`−6).

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