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keasiabradley
07.06.2020 •
Mathematics
N is a positive integer
i) Explain why n(n+1) must be an even number?
ii) Explain why 2n-1 must be an odd number?
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Ответ:
Step-by-step explanation:
product of two consecutive numbers is always even.
n(n+1)
case 1
if n is odd,let n=2k+1,where k is an integer
n+1=2k+1+1=2k+2=2(k+1)
n(n+1)=(2k+1)[2(k+1)]=2(2k+1)(k+1)=even number.
case 2
if n is even,let n=2m,where m is an integer.
n+1=2m+1
n(n+1)=2m(2m+1)=even integer.
so in both cases n(n+1) is even.
Ответ:
b = 10
Step-by-step explanation:
The expression 9x² - 100 is a difference of squares. It factors into the form (3x -b)(3x+b). Here b is the square root of 100. The square root is 10.
The factors are (3x -10)(3x+10).