(36 - 4t) squared.

The question is factorise by taking out the GCF which I did, and I got

4(9-t)(9+t)

The textbook answer sheet says the answer is

4(3-t)(3+t)

Where did I go wrong?

4(3-t)(3+t)

Step-by-step explanation:

after you find the GCF you will have 4(9-t) squared. since 9 is square you will after to put the square root of 9 (which is 3) into the equation when you factor it further. therefore giving you 4(3-t)(3+t). if you un- factored your equation you would get 4(81-t) because 9x9 is 81 not 3. hope this helps. just learned this too lol

step-by-step explanation:

7

step-by-step explanation: