Answer:
81x²-72x+16
Step-by-step explanation:
- For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area. This is the same as saying length² or length squared.
Therefore, (9x-4)²
=81x²-(2)(9x)(4)+4²
=81x²-72x+4²
=81x²-72x+16
