C3 Maths Functions Question

Hi All,
This will be my last post of the day regarding these pesky functions questions,
Basically I'm struggling to find the range of the function in the question (3b)
I've worked out the function fg(X) is 2x^2 + 7, but how do I find the range of this?
Thanks,
James


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What's the biggest that $2x^2+7$ can be? What's the smallest?

Hint : $x^2$ is always $\geq 0$.

So would the range just be 'greater than or equal to 7' ?


Posted from TSR Mobile