Answer:
Part a) The measure of the sides of triangle DEF are
![d_D_E=\sqrt{90}\ units](https://tex.z-dn.net/?f=d_D_E%3D%5Csqrt%7B90%7D%5C%20units)
![d_E_F=\sqrt{65}\ units](https://tex.z-dn.net/?f=d_E_F%3D%5Csqrt%7B65%7D%5C%20units)
![d_D_F=\sqrt{221}\ units](https://tex.z-dn.net/?f=d_D_F%3D%5Csqrt%7B221%7D%5C%20units)
Part b) Is a scalene triangle
Step-by-step explanation:
we know that
the formula to calculate the distance between two points is equal to
![d=\sqrt{(y2-y1)^{2}+(x2-x1)^{2}}](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B%28y2-y1%29%5E%7B2%7D%2B%28x2-x1%29%5E%7B2%7D%7D)
we have the coordinates
D(8,-6) E(-1,-3) F(-2,5)
step 1
Find the length side DE
D(8,-6) E(-1,-3)
substitute in the formula
![d=\sqrt{(-3+6)^{2}+(-1-8)^{2}}](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B%28-3%2B6%29%5E%7B2%7D%2B%28-1-8%29%5E%7B2%7D%7D)
![d=\sqrt{(3)^{2}+(9)^{2}}](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B%283%29%5E%7B2%7D%2B%289%29%5E%7B2%7D%7D)
![d_D_E=\sqrt{90}\ units](https://tex.z-dn.net/?f=d_D_E%3D%5Csqrt%7B90%7D%5C%20units)
step 2
Find the length side EF
E(-1,-3) F(-2,5)
substitute in the formula
![d=\sqrt{(5+3)^{2}+(-2+1)^{2}}](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B%285%2B3%29%5E%7B2%7D%2B%28-2%2B1%29%5E%7B2%7D%7D)
![d=\sqrt{(8)^{2}+(-1)^{2}}](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B%288%29%5E%7B2%7D%2B%28-1%29%5E%7B2%7D%7D)
![d_E_F=\sqrt{65}\ units](https://tex.z-dn.net/?f=d_E_F%3D%5Csqrt%7B65%7D%5C%20units)
step 3
Find the length side DF
D(8,-6) F(-2,5)
substitute in the formula
![d=\sqrt{(5+6)^{2}+(-2-8)^{2}}](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B%285%2B6%29%5E%7B2%7D%2B%28-2-8%29%5E%7B2%7D%7D)
![d=\sqrt{(11)^{2}+(-10)^{2}}](https://tex.z-dn.net/?f=d%3D%5Csqrt%7B%2811%29%5E%7B2%7D%2B%28-10%29%5E%7B2%7D%7D)
![d_D_F=\sqrt{221}\ units](https://tex.z-dn.net/?f=d_D_F%3D%5Csqrt%7B221%7D%5C%20units)
step 4
Classify the triangle by the measure of its sides
we have
![d_D_E=\sqrt{90}\ units](https://tex.z-dn.net/?f=d_D_E%3D%5Csqrt%7B90%7D%5C%20units)
![d_E_F=\sqrt{65}\ units](https://tex.z-dn.net/?f=d_E_F%3D%5Csqrt%7B65%7D%5C%20units)
![d_D_F=\sqrt{221}\ units](https://tex.z-dn.net/?f=d_D_F%3D%5Csqrt%7B221%7D%5C%20units)
so
Is a scalene triangle, because is a triangle in which all three sides have different lengths.
Answer:
(g-f) (-1)= sqrt(15)
(f/g)(-1)= 0
(g+f)(2)=sqrt(3)-3
(g*f)(2)=-3*sqrt(3)
Step-by-step explanation:
We have to eval the expressions given in the point indicated.
Lets start by the first equation
(g-f)(-1)= g(-1) - f(-1)=
= ![\sqrt{15}](https://tex.z-dn.net/?f=%5Csqrt%7B15%7D)
Now, lest continue with the others
(f/g)(-1)= f(-1)/g(-1)= (1-1)/sqrt(15)=0
(g+f)(2)=g(2)+f(2)=sqrt(3)-3
(g*f)(2)=g(2)*f(2)=sqrt(3)*(-3)=-3sqrt(3)
Answer:
The slope (m) = 1/3 and the y-intercept (b) = -4
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