Twice the square of a number minus 7

Step by step

The question

Question: write with math signs: twice the square of a number minus 7.

1 Change words to math

2 Put it in order

So we get 2n² − 7.

3 Check

Let's check with a number.

Say the number is 10.

Twice the square of 10 minus 7 is 193.

And 210² − 7 is 193 too.

So 2n² − 7 is right!

Let's look back.

First: change words to math.

Then: put it in order.

Last: check.