Solve y=-(4x+32)²: Finding Values Where Function is Negative

Question

Look at the function below:

y=(4x+32)2 y=-\left(4x+32\right)^2

Then determine for which values of x x the following is true:

f(x) < 0

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Analyze the structure of the function.
  • Step 2: Determine when the squared term is zero.
  • Step 3: Apply the negative sign.
  • Step 4: Conclude when the function is negative.

Now, let's work through each step:

Step 1: Analyze the function y=(4x+32)2 y = -\left(4x + 32\right)^2 . Note that the expression (4x+32)(4x + 32) is squared, and any square of a real number is non-negative.

Step 2: For (4x+32)2(4x + 32)^2 to equal zero, solve 4x+32=0 4x + 32 = 0 .

Solve 4x+32=0 4x + 32 = 0 :

4x=32x=8 4x = -32 \quad \Rightarrow \quad x = -8

Step 3: Apply the negative sign: Since (4x+32)2(4x + 32)^2 can only be zero or positive, applying the negative sign results in:

(4x+32)20 -\left(4x + 32\right)^2 \leq 0

Step 4: Conclude that f(x)<0 f(x) < 0 for all values except when (4x+32)2(4x + 32)^2 is zero. Thus, the function is negative for all x x except x=8 x = -8 .

Therefore, the solution is x8 x \ne -8 .

Answer

x8 x\ne-8