Question

Ms. Chibbaro asked her students to find an expression equivalent to 7 - 3(4 - 2x) - 10x Jon had the work shown to the Left on his paper. One step in Jon's wok is incorrect. Find and explain the error. Then write your own expression equivalent to the one given by Ms. Chibbaro.

Answer 1

`-15 + 6x`

Explanation:

Given

`Expression: 7 - 3(4 - 2x) - 10x`

Required

Determine Jon's error and make corrections.

Also, give the equivalent of the expression

The question has missing details because Jon's workings is not listed.

One mistake student's make during multiplications that involves minus (-) and plus (+) is in the signs.

So, watch out for the signs to know where the error is.

However, I'll give an equivalent of the given expression

`7 - 3(4 - 2x) - 10x`

Open Bracket

`7 - 12 + 6x - 10`

Collect Like Terms

`7 - 12 - 10 + 6x`

`-15 + 6x`

Hence, the given expression is equivalent to
`-15 + 6x`