Question

What should be taken away from 3
2 − 4
2 + 5 + 20 to obtain −
2 −
2+
6 + 20​

Answer 1

Answer:

3x

2

−4y

2

+5xy+20−q=−x

2

−y

2

+6xy+20

⇒q=3x

2

−4y

2

+5xy+20−(−x

2

−y

2

+6xy+20)

⇒q=3x

2

−4y

2

+5xy+20+x

2

+y

2

−6xy−20

⇒q=3x

2

+x

2

−4y

2

+y

2

+5xy−6xy+20−20

⇒q=4x

2

−3y

2

−xy+0

Hence, 4x

2

−3y

2

−xy should be subtracted.