Question

Forsimultaneousequationinx&yifD =36D =18andD=9 xy
then Y = .......... ?
1
A)4B)4 C)2 D)-2

Answer 1

Answer:

2..........................

Answer 2

Step-by-step explanation:

$</p><p></p><p>a2 +(2b)2−2(2b)(a)−(2c)2</p><p></p><p>using x2+y2−2xy=(x−y)2 we get , \\ </p><p></p><p>(a−2b)2−(2c)2 \\ </p><p></p><p>using x2−y2=(x+y)(x−y) , we get  \\ </p><p></p><p>(a−2b+2c).(a−2b−2c) \\ </p><p></p><p>$

hope it is helpful to u