11/23/09

Test 4 Section 6 - #16 (page 597)

As with any function question, just SUBSTITUTE whatever is inside the parentheses in for x. So if h(x) = 14 + (x2)/4, and the question asks about h(2m), just put 2m in for x. You'll get 14 + (2m)2 / 4, which is 14 + (4m2)/4, which is 14 + m2. Since we know h(2m) = 9m, that can now become 14+m2 = 9m. Cleaning that up, we get m2 - 9m + 14 = 0, which factors into (m - 2)(m - 7) = 0, so m is either 2 or 7.

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