Question

find the value of 64x2+125y2+60xy(4x+5y) if x =-3, y =4​

Answer 1

Step-by-step explanation:

$64 {x}^{2} + 125 {y}^{2} + 60xy(4x + 5y)$

$(64 \times - 3 \times - 3) + (125 \times 4 \times 4) + (60 \times - 3 \times 4)(4 \times - 3 + 5 \times 4)$

$576 + 2000 + ( - 720)( - 12 + 20)$

$2576 + ( - 720 \times 8)$

$2567 - 5760$

$- 3193$