Answer:
a. True. Rational numbers are closed under the sum operation, therefore, the sum of two rational numbers is always a rational number.
b. True. irrational numbers are closed under the sum operation, therefore, the sum of two irrationals numbers is always a irrational number.
c. True. The square of a real number is always a number greater than zero, and the sum of two numbers greater than zero is greater than zero.
d. True. The real numbers are closed under the product operation, then if a and b are reals numbers, the product ab is also a real number.
Step-by-step explanation:
Combine like terms the solve. For example:
5x + 20x = 100
25x = 100
/25 = /25
x =4
Answer:
(-infinity, inifinty)
Step-by-step explanation:
the domain should be all real numbers of this quadratic
