233k views
4 votes
Please let me know the correct answer.

Please let me know the correct answer.-example-1

1 Answer

1 vote

Answer:

He factored out a 2 from both (20x+18) and (20x+18), which is the same as factoring out a 4 from the whole expressions. It should be 4(10x+9)(10x-9) .

Explanation:

Firstly, he should find the common factor between 400 and 324, so 4 is the common factor between.

400x² - 324 = 4(100x² - 81)

Next, both 100 and 81 is a perfect square so he can factorised using the formula, (a+b)(a-b) = a² - b² :

4(100x²- 81) = 4(10x+9)(10x-9)

User Haris Farooqui
by
8.4k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories