Question

How do you evaluate `ab-cd` if `a=5, b=3, c=4, d=2`?

Answer 1

7

Explanation:

When two variables are placed next to each other like `ab` and `cd`, that means to multiply them together. It is the same thing as `2x`, except 2 is a number instead of a variable

So, first, multiply `a` to `b`
`5xx3= 15`

Then multiply `c` to `d`
`4xx2=8`

Finally, plug in your numbers back into the original equation
`ab=>15`
`cd=>8`
`ab-cd=?`
`15-8=7`

The answer is 7