Given:
Tom's earnings: x
Jan's earnings: 2x - 150
Total earnings: 1380
x + 2x - 150 = 1380
3x = 1380 + 150
3x = 1530
3x/3 = 1530/3
x = 510
Tom's earnings: x = 510
Jan's earnings: 2x - 150 = 2(510) - 150 = 1,020 - 150 = 870
total earnings: 1,380
510 + 870 = 1,380
1,380 = 1,380
The error is that there is not a decimal point in front of the 2
Correct: 5.8 - .2 = 5.6
Since
and
are roots of
, we can factorize the quadratic in terms of the roots as

Expanding the right side gives

so that

A polynomial with roots
and
would be

and expanding this gives

Now,

and

So we can write the second quadratic in terms of
as

and to make things look cleaner, scale the whole expression by
to get

Here is the mistake is on 9x1/100 because after decimal 9 is there means
9 has to be multiplied by 1/10 to get the 0.9
Here if we expand the 103.903 then from left to right
1 = 1x100 +
0 = 0x10 +
3 = 3x1 +
9 = 9x1/10+
0 = 0x1/100+
3 = 3x1/1000 = 103.903