Two numbers
Write down two numbers which differ by 2 and multiply to 168.
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With this you can form an equation:
ReplyDeletex = y + 2
x * y = 168
(y + 2) * y = 168
y² +2y = 168
y² + 2y - 168 = 0
Now we can solve this quadratic with the quadratic equation:
y = (-b ± √(b² - 4ac))/2a
y = (-2 ± √(676))/2
y = -2 ± 26/2
y = -2 ± 13
y = 11
y = -15