FailingstudentXD
15.10.2019 •
Mathematics
What number when multiplied by itself is 23 greater than the preceding number when it is multiplied by itself?
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Ответ:
12^2 = 144
11^2 = 121
144 - 121 = 23
Ответ:
expand
x²=23+x²-2x+1
x²=x²-2x+24
minus x² both sides
0=-2x+24
add 2x both sides
2x=24
divide by 2
x=12
the number is 12
Ответ:
=16(2)+24
=32+24
=56
So 56 seconds.