+0  
 
0
109
1
avatar

Let

f(x) = -x-3 if x <= -7

f(x) = 2x + 1 if x > -7

Find the sum of all values of $x$ such that f(x) = 0.

 May 12, 2022
 #1
avatar+9461 
0

Suppose x <= -7. When f(x) = 0, -x - 3 = 0. This means x = -3, which is not <= -7. This root is rejected.

 

Suppose x > -7. When f(x) = 0, 2x + 1 = 0. This means \(x = -\dfrac{\boxed{\phantom{\text{aaaaa}}}}{\boxed{\phantom{\text{aaaaa}}}}\).

 

Therefore, the sum of all values of x such that f(x) = 0 is \(-\dfrac{\boxed{\phantom{\text{aaaaa}}}}{\boxed{\phantom{\text{aaaaa}}}}\), as it is the only solution to f(x) = 0.

 

Please fill in the blanks.

 May 12, 2022

11 Online Users

avatar
avatar