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avatar+164 

If we graph these functions on the same coordinate plane.

f(x) =7

g(x)= x^2 +2x-8

 

What are the solutions to the equation f(x) = g(x)?

 

select each correct answer

 

-5

-3

3

5

7

 Mar 15, 2019
 #1
avatar+234 
+1

Per the last one, just plug these into a graphing calculator and it's easy to see the two intersection points are (-4, 7) and (3, 7). The reason this is the answer is that these two values are the only two values where both equations are equal to each other. Sorry I can't provide an example like CPhill. You can also figure this out by setting both equations equal to each other. \(x^2 + 2x - 8 = 7\). Subtracting 7 from both sides gets us \(x^2 + 2x - 15\). You can figure out the rest by putting this into the quadratic formula.

 

Hope this helps!

 Mar 15, 2019
 #2
avatar+102434 
+1

Thanks, Lag

 

Here's a graph : https://www.desmos.com/calculator/yvn9temz1q

 

The solutions occur at x = -5   and x = 3

 

 

cool cool cool

 Mar 15, 2019

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