Question

what should be taken away from 3x²-4y²+5xy +20 to be obtain the difference between 3x²+8y²+16xy+7and 10xy+4x²-13+9y²​

Answer 1

Step-by-step explanation:

Let q should be subtracted.

Then according to question,

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.