Question

Add: 8x 2 + 7xy – 6y 2 , 4x 2 – 3xy + 2y 2 and -4x 2 + xy – y ​

Answer 1

Answer:

8x² + 5xy – 5y²

Hope this helps you :)

Answer 2

Answer:

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Find the product.

(x−2y+3)(x

2

+4y

2

+2xy+6y−3x+9)

Medium

Solution

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Given : (x−2y+3)(x

2

+4y

2

+2xy+6y−3x+9)

The given question can be written as

=(x+(−2y)+30(x

2

+(−2y)

2

+3

2

−(x)(−2y)−(−2y)(3)−(3)(x))

According to the equation,

a

3

+b

3

+c

3

−3abc=(a+b+c)(a

2

+b

2

+c

2

−ab−bc−ca)

we get,

=x

3

+(−2y)

3

+3

3

−3×x×(−2y)×3

(x−2y+3)(x

2

+4y

2

+2xy+6y−3x+9)=x

3

−8y

3

+27+18xy