Question

$a( {a}^{2} - 1) = 60$
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Answer 1

Answer:

a(a^2-1) = 60

Here,

this equation is hence,

a^3 - a - 60 = 0

Clearly a = 4 is one of the roots of this equation since it's satisfying the equation found out by hit and trial.

Now,

However because the equation has three roots Being a cubic equation, the other two root can be found out by obtaining a quadratic equation by dividing the given equation by a-4 and finding the other solutions.

Hope this helps you !

Answer 2

Answer:a=4

Step-by-step explanation:

a=4

4(4^2-1)=4(16-1)=4*15=60