Question

(x²-2xy+y²)+(x²+2xy+y²)=?

(x²-2xy+y²)-(x²+2xy+y²)=?

Answer 1

2

Explanation:

If the constant of proportionality is k then,

y=kx

What number do we multiply by x to get y?

The constant of proportionality is 2.

Answer 2

See below in bold.

Explanation:

(x²-2xy+y²)+(x²+2xy+y²)

= x²-2xy+y²+ x²+2xy+y²

= 2x² + 4xy + 2y².

(x²-2xy+y²)-(x²+2xy+y²)

= x²- 2xy + y²- x² - 2xy - y²

= -4xy.