Question

If x+2y=9 and xy=7, find the value of x²+4y².​

Answer 1

Answer:

Step-by-step explanation:

sincexy=7

so x=7/y

a/q

x+2y=9

or 7/y+2y=9

or 2y^2+9y+7=0

or 2y ^2+7y +2y +7=0

or y(2y+7)+1(2y+7)=0

or (y+1)(2y+7)=0

so y=-1,-7/2

if y=-1

then x=7/(-1)=-7

if y=-7/2

then x=14/(-7)=-2

Answer 2

Answer:

here above is the answer

thanks,

but one mistake, 81-28=53 hehe .sorry