Combining like terms

x^2-5xy+4y^2

Step-by-step explanation:

In the equation we see only 1 example of like terms, 2xy-7xy=-5xy

So the simplified equation is

x^2-5xy+4y^2

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!