Question

Using identity, find the value of the following:
i) 25x square +60xy + 36y square if x=-1, y=2

please send me right answer and I seen from the back of the book it's answer is 49...​

Answer 1

Answer:

It's 49

Pls mark me as brainliest pls.

Answer 2

Answer:

Answer

25x

2

+36y

2

+49z

2

+60xy−84yz−70zx

Keeping 5x=a, 6y=b, −7z=c

We get, a

2

+b

2

+c

2

+2ab+2bc+2ca=(a+b+c)

2

⇒(5x+6y−7z)

2

.

Hence, the answer is (5x+6y−7z)

2