Because the angles are equal so are the sides since is in isosceles triangle, so
4x= x+3; 4x-x=3; 3x=3; x=1
Answer is D
Answer:

Step-by-step explanation:
Use formula

Hence,

This expression is equal to

so we can equate the coefficients at powers of x:

Answer:
c
Step-by-step explanation:
Answer:
-13/20
Step-by-step explanation:
-4/5 x 4/4 = -16/20
3/20 x 1/1 = 3/20
-16/20 + 3/20 = (-16 + 3 = -13)
-13/20