We can use the Front Outside Inside Last (FOIL) method to expand the double bracket

Front ⇒

Outside ⇒

Inside ⇒

Last ⇒

Put the four terms together we have

, then collect like terms
The derivative of
at a point
in the direction of a vector
is

We have

and

Then the derivative at
in the direction of
is


Angles forming linear pair are :

And we know, they are supplymentary
So, the measures of the given angles are :
And
_____________________________

K+ 3k = 940
4k= 940
K= 940/4
K= 235
H= 3k
H= 3×>235 = 705
K= 235
H= 705
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Answer:48 sq. Inches
Step-by-step explanation: