Question

Original equation V(x) = (4x)^2 (160-5x)

Find the possible values of x when V = 60 000. (Give values correct to 2 decimal places.)
60000 = (4x)^2 (160-5x)

Answer 1

x ∈ {-4.53, 5.30, 31.23}

Explanation:

Finding irrational roots of cubic equations is best done using a graphing calculator. This one shows the values of x to be ...

x ∈ {-4.53, 5.30, 31.23}