Question

7x^2-8xy+y2-2x^2+8xy-3y^2 при x = -2 и y = 1/2

Answer 1

Ответ:

надеюсь я вам помогла с решением

Answer 2

To evaluate the expression 7x^2 - 8xy + y^2 - 2x^2 + 8xy - 3y^2 at x = -2 and y = 1/2, we substitute these values into the expression:

7(-2)^2 - 8(-2)(1/2) + (1/2)^2 - 2(-2)^2 + 8(-2)(1/2) - 3(1/2)^2

Simplifying the expression further:

7(4) + 8 + 1/4 - 2(4) - 8 + 3/4 28 + 8 + 1/4 - 8 - 8 + 3/4 36 + 1/4 - 8 + 3/4 36 - 8 + 1/4 + 3/4 28 + 4/4 28 + 1 29

Therefore, when x = -2 and y = 1/2, the expression 7x^2 - 8xy + y^2 - 2x^2 + 8xy - 3y^2 evaluates to 29.