<span> 2 square root of 7 − square root of 28
= 2</span>√7 - √28
= 2√7 - 2√7
= 0
Answer:

Step-by-step explanation:


Sum of an irrational number and a rational number is always irrational. Take for example 1/2 +

. Clearly, 1/2 is rational and its decimal expansion is equal to 0.5, while

is irrational and has a non-repeating, non-terminating decimal expansion. When you add the two, you are obviously going to get a non-repeating, non-terminating decimal expansion, hence the sum is irrational.
Answer:
C
Step-by-step explanation:
Two like therms have the same literal part, in case we have two terms:
6y^3z and 8y^3z
Answer:
there is only one easy way to sole this
using quadratic equation

Step-by-step explanation:
a=6 b=5 c=-6
and by applying it to the equation you will get
x=0.66 and x=-1.5