5x2 -605 is the same thing
First factor out the 5
5(x2 -121)
Now note this is the difference of squares
so we factor it as
5(x+11)(x-11)
and we are done!
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For a number to be divisible by another number it must be at least that number. As 3 is less than 605 it cannot be divisible by 605. Also 3 is not a FACTOR of 605, that is 3 does not divide into 605 without remainder.
All multiples of 605 are divisible by 605:605, 1210, 1815, 2420, 3025, ...The numbers that 605 is divisible by, ie the numbers that divide 605 exactly, are its factors which are: 1, 5, 11, 55, 121, 605
605 = DCV
√605 = 24.5967478 ■
605 in Roman numerals is DCV.