Stion
Factor the difference of squares.
x2 - 400
The factored form of x2 - 400 is

The factored form of x²-400 is (x+20)(x-20).

Step-by-step explanation:

Given the expression

As the square of 20 is 400. Therefore, rewrite 400 as 20²

⇒

Thus, the expression becomes

Thus, the factored form of x²-400 is (x+20)(x-20).

60

step-by-step explanation:

every triangle measures a total of 120 degrees. you have to find angle c. we know that isosceles triangles angles are equal. 60 degrees plus 60 degrees gives you 120.

answer: cos [   arcsin (3/5) - arccos (1/2) ] =

step-by-step explanation: × = 3/5 = 0.6--> x = 36.87 and x = 180 - 36.87 = 143.13 deg

cos y = 1/2 --> y = +- 60 deg a. cos (x - y) = cos (143.13 - 60) = cos 83,13  

=

0.12

b. cos (36.87 - 60) = cos (-23.23) = 0.92