Question

Evaluate 3x² - 4xy + 2y² - 1 for x = - 3 and y = 5

Answer 1

Answer: 136

Substitute -3 for x and 5 for y.

`3x^2 - 4xy + 2y^2 - 1`

`3(-3)^2-4(-3)(5)+2(5)^2-1`

`3(9)-4(-15)+2(25)-1`

`27+60+50-1`

`87+50-1`

`137-1`

`136`

hope this helped!

Answer 2

`3x^(2) - 4xy + 2y { }^(2) - 1 \\ 3 * ( - 3) { }^(2) - 4 * ( - 3) * 5 + 2 * 5 {}^(2) - 1 \\ (3 * 9) - ( - 60) + 50 - 1 \\ 27 + 60 + 50 - 1 \\ 165`