Question

(x-3y)^2 + 6xy with step by step​

Answer 1

Answer:

1.1     Evaluate :  (x-3y)2   =    x2-6xy+9y2  

1.2     Evaluate :  (y-x)2   =    y2-2xy+x

8y2 - 4xy  =   -4y • (x - 2y)

-4y • (x - 2y)

Answer 2

Step-by-step explanation:

Potential energy is energy due to position.

Potential energy is scalar quantity having magnitude.

Sl unit of P.E is Joules.

CGS unit of P.E is erg.

Potential energy of an object is given by

P.E = mgh

where,

P.E denotes potential energy.

m denotes mass.

g denotes gravitational field.

h denotes height.

Substituting all the given values in the formula,

➠ P.E = mgh

➠ 98000 = (100)(9.8)(h)

➠ 98000 = 980h

➠ h = 98000/980

➠ h = 100 m{.}.

thus, the height through which it is lifted is 100m.