The equivalent equation is x² + 20x = -102
<h3>
Simplification of quadratic equation</h3>
The equivalent equation can be obtained by factorizing or simplifying the given quadratic equation as shown below;
x² + 20x + 81 = -21
<em>collect similar terms together</em>
x² + 20x + 81 + 21 = 0
x² + 20x + 102 = 0
The equation can also be written as x² + 20x = -102
Thus, the equivalent equation is x² + 20x = -102
Learn more about simplification of quadratic equation here: brainly.com/question/1214333
Answer:
See explanation
Step-by-step explanation:
Statements Reasons
1. 
Given
2. 
As alternate interior angles when parallel lines AD and BC intersect by ltransversal BD
3. 
Given
4. 
Reflexive property
5. 
SAS postulate
6. 
Corresponding parts of congruent triangles are congruent
7. 
Inverse alternate interior angles theorem
Your answer is...…
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22!
Let r represent reptiles
210=3r-120
330=3r
110=r
110 reptiles
The minimum is <em>X=1</em> and <em>Y=3</em>, so the minimum is <em>x=3</em>. Use a graphing calculator then Google Search, "<em>How to find the minimum of a graph using a graphing calculator.</em>". The process of this is way to long to explain here, and is best explained visually.
