From 6x2−7xy+8y2 subtract the sum of x2−3xy−y2 and 2x2+5xy−4y2 *every 2 is supposed to resemle -to the power of two- it just woudn't let me type it like that.

The sum of x^2−3xy−y^2 and 2x^2+5xy−4y^2:

x^2−3xy−y^2 + 2x^2+5xy−4y^2

= 3x^2 + 2xy - 5y^2

From 6x^2−7xy+8y^2 subtract the sum of x^2−3xy−y^2 and 2x^2+5xy−4y^2:

6x^2−7xy+8y^2 - (3x^2 + 2xy - 5y^2)

= 6x^2−7xy+8y^2 - 3x^2 - 2xy + 5y^2

= 3x^2−9xy + 13y^2

Answer

3x^2−9xy + 13y^2

c

step-by-step explanation:

i think because what else can be a sample of every member