Question

If x = 2 and y = –1 then the value of 7x² –3xy +5y² is​

Answer 1

Answer:

28+7+5

40 is the answer hope it helpful for you

Answer 2

Answer:

$x = 2 \\ y = - 1 \\ find \\ 7 {x }^{2} - 3xy + 2 {y}^{2} \\ put \: vlue \: \\ 7(2) {}^{2} - 3xy + 5 {y}^{2} = \\ 7 \times 4 - 3 \times 2 \times ( - 1) + 5 \times ( - 1) {}^{2} = \\ 28 + 6 + 5 = \\ 33 +6 = 39$