This is a type 2 question and it should be in a (a-b)^2 format and not in a (a+b)^2 format . The sign in the final answer should be '-' Final answer : (3x-8y)^2

This student's working is correct, however his/her answer is wrong. The answer should be "(3x - 8y)^2" and not "(3x + 8y)^2" as the formula is (a-b)^2 = a^2 = 2ab + b^2

The answer should be -> 9x^2 - 48xy + 64y^2 = (3x)^2 - 2(24xy) + (8y)^2 = (3x - 8y)^2

The answer is suppose to be (3x-8y)^2

ReplyDelete(3x)^2 - 2(24xy) + (8y)^2 ≠ (3x+8y)^2

ReplyDelete= (3x-8y)^2

Owen and shawn kit btwfyi.

in this situation, it should be (a-b)^2.

ReplyDeleteas a is 3x and b is 8y, it should be (3x-8y)^2 instead of (3x+8y)^2

Whats wrong: operation error

ReplyDeleteHow it should look like: = (3x-8y)^2

Sandy and Ruoyu

This is a type 2 question and it should be in a (a-b)^2 format and not in a (a+b)^2 format .

ReplyDeleteThe sign in the final answer should be '-'

Final answer : (3x-8y)^2

This is a type 2 question, therefore the answer should be in (a-b)^2 format. So the answer should be (3x - 8y)^2, not (3x + 8y)^2.

ReplyDeleteYi Chieh,Kai En, Jiajun

ReplyDeleteThe answer should be (3x-8y)^2 because it follows the pattern of (a-b)^2.

(abhi and toby)

ReplyDeleteThis student's working is correct, however his/her answer is wrong. The answer should be "(3x - 8y)^2" and not "(3x + 8y)^2" as the formula is (a-b)^2 = a^2 = 2ab + b^2

ReplyDeleteThe answer should be ->

9x^2 - 48xy + 64y^2

= (3x)^2 - 2(24xy) + (8y)^2

= (3x - 8y)^2