Polynomial equation: x3 + 6x2 - 40x = 192

Solutions: x = - 8, x = - 4, and x = 6

In the context of this problem, which solutions to the polynomial equation can you eliminate because they do not make sense?

x = - 8

x = - 4

x = 6

If we substitute the correct value of x into the right side of the given expression, it should yield 192.

Test x = - 8

(-8) ^3 + 6 (-8) ^2 - 40 (-8) = 192 Correct

Test x = - 4

(-4) ^3 + 6 (-4) ^2 - 40 (-4) = 192 Correct

Test x = 6

6^3 + 6 (6^2) - 40 (6) = 192 Correct

All solutions make sense, so none of them should be eliminated.