It is 28 i think been 3 year since i did this
5x^2-8x+5=0
ax^2+bx+c=0; a=5, b=-8, c=5
Quadratic Formula:
x=[-b+-sqrt(b^2-4ac)]/(2a)
x=[-(-8)+-sqrt( (-8)^2-4(5)(5) )] / [(2)(5) ]
x=[ 8+-sqrt(64-100)] / 10
x=[ 8+-sqrt(-36)] / 10
x=[8+-sqrt( (36)*(-1)) ] /10
x=[8+-sqrt(36)*sqrt(-1)] / 10
x=(8+-6i) / 10
x=(8/2+-6i/2) / (10/2)
x=(4+-3i)/5
x1=(4-3i)/5
x2=(4+3i)/5
Answers:
x=(4-3i)/5 , x=(4+3i)/5
Answer: 2520 cm³
Step-by-step explanation:
1. You must use the following formula for calculate the volume of a triangular pyramid, which is:

Where B is the area of the base and h is the height.
2. Calculate the area of the triangular base:

3. Susbstiute values into the formula for calculate the volume. Then, you obtain the following result:

Answer:
A. 36
Step-by-step explanation:
65+79=144
180-144=36