Quantity Comparison (Q1 vs Q2)

Master Quantity Comparison (Q1 vs Q2). Solve two independent quantities and compare them ($>, <, =, \ge, \le$). Covers Quadratic, Arithmetic, and Geometry.

Model 1: The Comparison Framework

      <ul class='list-disc pl-6'>
        <li><strong>The Core:</strong> You are given two quantities, <strong>Quantity I</strong> and <strong>Quantity II</strong>. You must find their values and compare them.</li>
        <li><strong>Options Standard:</strong>
          <br>A) Quantity I > Quantity II
          <br>B) Quantity I < Quantity II
          <br>C) Quantity I тЙе Quantity II
          <br>D) Quantity I тЙд Quantity II
          <br>E) Quantity I = Quantity II or No Relation
        </li>
        <li><strong>Strategy:</strong> Do NOT estimate unless gap is huge. Calculate exact values. If Q1 depends on a variable range (e.g., $x^2=4 	o x=pm2$), test ALL cases against Q2.</li>
      </ul>
    

Example:

Q: Q1: Value of x if x2=25x^2=25. Q2: Value of y if y3=125y^3=125.
Solution: Q1: x=+5,тИТ5x = +5, -5. Q2: y=5y = 5. Compare: +5=5, -5<5. So xleyx le y.

Model 2: Quadratic Inequalities

      <ul class='list-disc pl-6'>
        <li><strong>Sign Method:</strong> Use sign of constants to predict root signs. (+,+) roots < (-,+) roots? No, verify values.</li>
        <li><strong>Range Comparison:</strong> If Q1 is an interval [a, b] and Q2 is [c, d], compare endpoints. Overlap usually means 'No Relation'.</li>
        <li><strong>Common Trap:</strong> $sqrt{x^2} = |x|$ (always +ve), but if $x^2=16$, $x=pm 4$. Watch out for these definitions.</li>
      </ul>