to find A
arc cos(267/391) = 46.93
to the nearest degree = 47 degrees
You can use z = x², then rewrite the equation as
4z²-21z+20 = 0
This factors as
(4z-5)(z-4) = 0
so has solutions
z = 5/4, 4
The solutions for x are then
x = ±√z = {-2, -(√5)/2, (√5)/2, 2}
These equations that are neither parallel nor perpendicular.
5x^2+3xy-25x-15y= 5x^2-25x+3xy-15y=
5x(x-5)+3y(x-5)=
= (x-5)(5x+3y)
Answer: Can I see a better pic?
Step-by-step explanation: