There are 3 dancers, Bingo , Mingo and Tingo .
They are dancing, and during their dance, they move along the path in the Cartesian plane as stated below.
Bingo : : : : y = x 3 − 5 2 x + 9 6
Mingo : : : : y = x + 4 4
Tingo : : : : y = x 4 − 2 4 x 3 + 1 4 8 x 2 − 3 3 6 x + 2 5 6
They all yell out "WOW" if they all meet at a point.
The point where they yell "WOW" can be stated as ( a , b ) in Cartesian system, and a and b are integers . Find the value of a + b
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Intersecting Bingo and Mingo, we have x 3 − 5 2 x + 9 6 = x + 4 4 ⟹ x = 1 , 2 − 1 ± 2 0 9 . Hence, x = 1 because the coordinates must be integers. All that is left is to check that y = 4 5 in all cases, which it does.
Why does that imply x=1?
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In B i n g o 's equation, put the value of y from M i n g o 's equation. Then you get the equation
x + 4 4 = x 3 − 5 2 x + 9 6
That is , x 3 − 5 3 x + 5 2 = 0
By observation only, 1 is a root of this equation, thus 1 is a common solution of B i n g o and M i n g o 's equations for the point of yelling.
And the equations actually are
B i n g o : : : : y = ( x − 2 ) ( x − 6 ) ( x + 8 )
M i n g o : : : : y = x + 4 4
T i n g o : : : : y = ( x − 1 6 ) ( x − 4 ) ( x − 2 ) 2
Even if you can't factorize, just try putting x = 1 in all equations, everytime you get the value of y as 4 5 .
Hence the point where they meet is ( 1 , 4 5 ) and hence asked a n s w e r is 4 6