You need to foil it out. That's how you get the answer.
(x+4)^20
=
(x+4) x (x+4)^19
=
(x+4)^2 x (x+4)^18
etc.
The slope of the perpendicular line is the negative reciprocal of that of the given line, so is
-1/(3/5) = -5/3
Then the point-slope equation of the perpendicular line can be written as
y = (-5/3)(x -15) -5
y = (-5/3)x +20
The y-intercept of the perpendicular line is y=20.
Answer:
30 cm
Step-by-step explanation:
Step 1: The surface area of a cube = 6a^2, where "a" is the side of the cube.
Step 2: We are given surface area of a cube = 5400.
Step 3: Now plug in the surface area of the cube = 5400 and simplify.
5400 = 6a^2
a^2 = 5400/6
a^2 = 900
Now take square root on both sides, we get
a = √900
a= 30 cm
Therefore, the side of the cube is 30 cm.
Thank you.