Grade 10Algebra
x and y are real numbers and x>y
x^2-xy+y^2=15
xy+x+y=13
find x^2+6y
1 Answer
Sher Mohammad
x^2-xy+y^2+3(xy+x+y)=15+3*13=64
(x+y)^2+3(x+y)=64
let x+y=z
z^2+3z-64=0
x+y, 6.63, -.9.63
xy=13-6.63=.37
use the above two equation to calculate x^2+6y
(x+y)^2+3(x+y)=64
let x+y=z
z^2+3z-64=0
x+y, 6.63, -.9.63
xy=13-6.63=.37
use the above two equation to calculate x^2+6y
Other Related Questions on algebra
How do you write “the product of 18 and q” as an algebraic expression?
How do you write “the product of 18 and q” as an algebraic expression?
algebra
Last Activity: 2 Years ago