Question

(iii) (6-5xy) (6 + 5xy)

Answer 1

Hello there!

Answer:

`36 - 25x^(2)y^(2)`

Explanation:

We can use the special formula:

`(a - b)(a + b) = a^(2) - b^(2)`

If a = 6 and b = 5xy then:

`(6 - 5xy)(6 + 5xy) = 6^(2) - (5xy)^(2) = 36 - 25x^(2)y^(2)`

This is the final answer

But if we don't know this formula, we can solve it other way:

`(6 - 5xy)(6 + 5xy) = 6^(2) + 5xy * 6 - 5xy * 6 - (5xy)^(2) = \\\\= 6^(2) - (5xy)^(2) = 36 - 25x^(2)y^(2)`