Question

if 9l²-klm+4m² is a perfect square,k=10+x,then x=
​

Answer 1

Answer:

x = 2

Step-by-step explanation:

$9 {l}^{2} - klm + 4 {m}^{2} \\ {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2} \\ {(3l)}^{2} - (2 \times 3l \times 2m) + {(2m)}^{2} \\ \\ 12lm = klm \\ k = 12 \\ k = 10 + x \\ 12 = 10 + x \\ x = 12 - 10 \\ x = 2$

x = 2

hope you get your answer