Actually, double-check discriminant: 7² + 4×3×220 = 49 + 2640 = 2689, √2689 = ? - Coaching Toolbox
Actual Double-Check: Solving Discriminant Expression 7² + 4×3×220 = 2689 – What’s √2689?
Actual Double-Check: Solving Discriminant Expression 7² + 4×3×220 = 2689 – What’s √2689?
In mathematical problem-solving, accuracy matters at every step—especially when working with discriminants or complex expressions. Recently, a key verification step sparked attention: calculating the discriminant formed by the expression 7² + 4×3×220, followed by finding √2689. Let’s walk through this process carefully and validate what’s truly happening under the math.
Understanding the Context
Step 1: Evaluate the Expression Inside the Discriminant
We start with:
7² + 4 × 3 × 220
Following the order of operations (PEMDAS/BODMAS):
- Compute 7² = 49
- Compute 4 × 3 = 12, then 12 × 220 = 2640
- Add the results:
49 + 2640 = 2689
So, the discriminant simplified expression is indeed 2689.
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Key Insights
Step 2: Calculate √2689 – What Value Does It Yield?
Now, we compute √2689, the square root of 2689. Unlike perfect squares (e.g., √256 = 16), 2689 is not a perfect square, so the square root is irrational.
Let’s estimate:
- 51² = 2601
- 52² = 2704
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Since 2601 < 2689 < 2704, it follows that:
51 < √2689 < 52
Using linear approximation or a calculator for better precision:
√2689 ≈ 51.86 (rounded to two decimal places)
This decimal precision is useful in algebraic contexts—especially when checking discriminant properties in quadratic equations.
Why This Verification Matters
In quadratic equations of the form ax² + bx + c = 0, the discriminant D = b² − 4ac determines the nature of roots:
- If D > 0: two distinct real roots
- If D = 0: one real root (repeated)
- If D < 0: complex roots
In our expression 7² + 4×3×220, this calculation leads to D = 2689, so D > 0 implies two distinct real roots—critical information for solving or analyzing quadratic models in science, engineering, or finance.
