Find the two x-intercepts of the function f and show that f′(x) = 0 at some point between the two x-intercepts. f(x) = x2 + 6x

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
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ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
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Chapter8: Graphing Quadratic Functions
Section: Chapter Questions
Problem 16CT
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Find the two x-intercepts of the function f and show that f′(x) = 0 at some point between the two x-intercepts. f(x) = x2 + 6x

Expert Solution
Step 1

Given function

fx=x2+6x

It is continuous and differentiable on real number line.

Therefore, substitute fx equals to zero to get intercepts

x2+6x=0xx+6=0x=0, -6

Hence the two intercepts are 0,0, -6,0

Therefore the x-intercept are 0 and -6.

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