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iamsecond235p318rq
14.09.2019 •
Mathematics
Determine the truth values of these statements
a) the product of x 2 and x 3 is x 6 .
b) 2π + 5π = 7π
c) x 2 > 0 for any real number.
d) the integer 315 − 8 is even.
e) the sum of two odd integers is even.
f) √ 2 ∈ z
g) −1 ∈/ z +
h) π ∈ q
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Ответ:
a) False b) True c) False d ) False e) True f) False g) False h) False
Step-by-step explanation:
a) False
x² × x³ =![x^5](/tpl/images/0231/2724/1332b.png)
When we multiply two exponential number with same base, their powers add up.
b) True
2π + 5π = π(2+5) = 7π
The coefficients of π are added together.
c) False
x² ≥ 0. For any value of x, negative or positive x² is always positive. But for x = 0, x² = 0×0 = 0
d) False
315 - 8 = 307, which is clearly an odd number.
e)True
The sum of all integers is always even.
Let m and n be two odd integers.
Thus, they can be expressed as m = 2r + 1 and n = 2s +1, where r and s are even integers.
m + n = 2r +2s + 2, which is clearly even.
f) False
Since √2 is an irrational number. It cannot belong to z, which is collection of all integer number.
√2 ∉ z
g) False
Since -1 is a negative integer, it cannot belong to
, as it is collection of all positive integers.
h) False
π cannot belong to Q because Q is a collection of all rational numbers and π is not a rational number. The decimal expansion of π is non- terminating that is it does not end.
Ответ:
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Step-by-step explanation: