Yahoo Answers: Answers and Comments for Suppose f(x) = x2 + 16x + 7. What is the xcoordinate of the larger xintercept? [Mathematics]
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From Adam
enSG
Sun, 21 Jul 2019 23:53:07 +0000
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Yahoo Answers: Answers and Comments for Suppose f(x) = x2 + 16x + 7. What is the xcoordinate of the larger xintercept? [Mathematics]
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From Φ² = Φ+1: f(x) = x² + 16x + 7 = x² + 16x + 64  57 = (x ...
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Mon, 22 Jul 2019 02:20:21 +0000
f(x) = x² + 16x + 7 = x² + 16x + 64  57 = (x + 8)²  57
f(x) = 0 when (x + 8)² = 57 , so when x = 8 + √57 and when x = 8  √57
So the larger x intercept is 8 + √57, which has the coordinates (8 + √57, 0)

From alex: f(x)=0> x = 8+√57
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https://sg.answers.yahoo.com/question/index?qid=20190721235307AApGWZt
Mon, 22 Jul 2019 00:03:08 +0000
f(x)=0> x = 8+√57