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Jinesha
10.12.2020 •
Mathematics
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Ответ:
Step-by-step explanation:
1 is 28
2 is 24
3 is 7
4 is 9
Ответ:
n x (n+1) =210
Then you open up the brackets
n^2 +n=420
n^2 + n -420 =0
Because -20 x 21= -420
And 21-20=1, 21 and -20 have become the roots of this equation.
(n^2 + 21n)(-20n -420)=0
Factorise
n(n+21) -20(n+21)
(n+21)(n-20)
n+21=0, n-20=0
n=-21, n=20