Is the equation a true or false statement?
We have hundreds of course questions with personalized recommendations + Account 100% premium
Is the equation a true or false statement?
To assess whether the equation is a true or false statement, we follow these steps:
Step 1: Expand :
Step 2: Simplify this expression:
Step 3: Evaluate the right side:
Step 4: Compare to :
Clearly, , as the former includes the terms , while the latter is simply reduced by 9.
Therefore, the equation is a Lie (false statement) because the left and right sides do not match for any value of .
Lie
Solve:
\( (2+x)(2-x)=0 \)
You can only cancel terms when they appear on both sides with the same coefficient. Here, the left side has additional terms (8x + 15) that don't exist on the right side.
Let's check! Set x² + 8x + 15 = x² - 9. This gives us 8x + 15 = -9, so 8x = -24, and x = -3. But even at x = -3, we get different values on each side!
If you're asked to verify an equation, always expand to compare. If you're solving for x, you might factor. The problem type determines your approach!
An equation is true for specific x-values, but an identity is true for ALL x-values. Since this equation isn't true for any x-value, it's neither!
Great observation! FOIL gives you four products, but some terms are like terms that combine. Here, +3x and +5x combine to make +8x.
Get unlimited access to all 18 Short Multiplication Formulas questions, detailed video solutions, and personalized progress tracking.
Unlimited Video Solutions
Step-by-step explanations for every problem
Progress Analytics
Track your mastery across all topics
Ad-Free Learning
Focus on math without distractions
No credit card required • Cancel anytime