Question

Factorise completely.
9t^2- u^2​

Answer 1

Answer:

(9t+u)(9t-u)

Step-by-step explanation:

Refer to image for steps:

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Answer 2

Answer:

Step-by-step explanation:

9t² - u²

1) use the identity → (a-b) (a+b) = a²+b²

2) √9 = 3

3) thus, we can conclude (3t-u) (3t+u)

4) check your work:

(3t-u) (3t+u)

9t²+3tu-3tu-u²

9t²-u²