Question

Find the square. (7m − 3)2

Answer 1

The square of (7m-3)2 is  49m squared minus 42m+9

Answer 2

The answer is
`49m^2-42m+9`

Explanation:

In order to determine the answer, we have to know about square of a binomial.

A binomial expression is the addition of two terms. If the binomial expression is powered by two, there are some rules to expand the expression:

1. square first term.
2. Twice the product of the two terms.
3. square second term.

In this case, the binomial expression is
`7m-3`. So the first term is
`7m` and the second term is
`-3`. Also there is a power, 2.

So, according to the rules:

`(7m-3)^2=(7m)^2+2*(7m)*(-3)+(-3)^2=49m^2-42m+9`

Finally, the answer is
`49m^2-42m+9`