Solve the equation (2x - 7)(x^2 - 9)(2x + 5) - 91 = 0

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Ex 4.2-11
Solve the equation (2x - 7)(x^2 - 9)(2x + 5) - 91 = 0

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Here I was trying to factorise the quartic using trial and error....

michaeltennant
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You have to play around with delta and you will solve it too.

ColonelRoseru