Question 13

If $$y^2 = y + 7$$, then what is the value of $$y^3$$?

Solution

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$$y^2=y+7.$$

or, $$y^3=y\left(y+7\right).$$

or, $$y^3=\left(y^2+7y\right).$$

Now, given that $$y^2=y+7.$$,

So, $$y^3=y+7+7y.$$

or, $$y^3=7+8y.$$

A is correct choice.

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