Perplexing problem :/

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<p><a href="https://www.dropbox.com/s/l4b0gjmz4gi821u/270520131933.jpg%5B/url%5D"&gt;https://www.dropbox.com/s/l4b0gjmz4gi821u/270520131933.jpg&lt;/a&gt;&lt;/p>

<p>This problem is driving me mad..</p>

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<p>I just put each function in my graphing calculator, then pressed ZOOM 6 to get it in a standard window. Zoom in if you want using ZBox. Then use the cursor to see that the point is (5,6). So the answer is 5+6=11, choice (C).</p>

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<p>what if i don’t use a graphing calc?</p>

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<p>Here’s another way. Note that the minimum value of f occurs at x = -b/(2a) = 10/2 = 5. Then compute f(5) = 5 and g(5) = 7. So the point we are looking for is (5,6), and the answer is 5+6=11, choice (C).</p>

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<p>ahaaaa. yeah makes sense :D</p>

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<p><a href=“Dropbox - Error - Simplify your life”>Dropbox - Error - Simplify your life;

<p>^ can someone explain derivatives, so I can solve this?</p>