Let \( a = 9 \), and \( c = 15 \). So, \( 9^2 + b^2 = 15^2 \).

["Title: Solving the Pythagorean Equation: A Step-by-Step Guide with ( a = 9 ) and ( c = 15 )", "Are you exploring Pythagorean theorem applications? Look no further! This article breaks down the classic equation ( 9^2 + b^2 = 15^2 ) step by step and helps you find the missing side ( b ). Whether you're a student learning geometry or a curious learner, understanding how to solve such problems unlocks deeper insights into right triangles and algebra.", "---", "### Understanding the Pythagorean Theorem", "The Pythagorean theorem states that in a right-angled triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. In equation form:", "[\na^2 + b^2 = c^2\n]", "Here:\n- ( a ) and ( b ) are the two legs (non-hypotenuse sides),\n- ( c ) is the hypotenuse (longest side).", "In this specific problem, we’re given:\n- ( a = 9 )\n- ( c = 15 )\n- We need to solve for ( b )", "---", "### Applying the Values: ( 9^2 + b^2 = 15^2 )", "Start by substituting the known values into the equation:", "[\n9^2 + b^2 = 15^2\n]", "Calculate the squares:", "[\n81 + b^2 = 225\n]", "Next, isolate ( b^2 ) by subtracting 81 from both sides:", "[\nb^2 = 225 - 81\n]\n[\nb^2 = 144\n]", "Now take the square root of both sides to solve for ( b ):", "[\nb = \sqrt{144} = 12\n]", "---", "### Verifying the Solution", "Always double-check your work. Plug ( b = 12 ) back into the original equation:", "[\n9^2 + 12^2 = 15^2\n]\n[\n81 + 144 = 225\n]\n[\n225 = 225\n]", "✅ The equation holds true — confirming that ( b = 12 ) is correct.", "---", "### Additional Insights & Practice", "This problem illustrates a common scenario in right triangle mathematics. By fixing two sides and solving for the third, you apply core principles used in trigonometry, construction, and physics.", "Practice Exercise:\nTry solving other equations:\n- Let ( b = 12 ), find ( a ) if ( c = 15 )\n- Or use ( a = 9 ), ( c = 15 ) to find ( b ) again using the same method", "You can also explore variations involving decimal or fractional sides, enhancing your understanding of real-world triangle problems.", "---", "### Why This Matters", "Mastering equations like ( a^2 + b^2 = c^2 ) builds a strong foundation in algebra and geometry. These principles appear in architecture, engineering, computer graphics, and more — making them essential skills for anyone interested in STEM fields.", "---", "Summary:\nGiven ( a = 9 ) and ( c = 15 ), the Pythagorean equation ( 9^2 + b^2 = 15^2 ) leads to ( b = 12 ). This simple but powerful triangle problem demonstrates how algebra and geometry intersect—key for solving both academic challenges and real-life problems.", "---", "Keywords: Pythagorean theorem, solve for b, right triangle, algebra example, teach geometry, ( 9^2 + b^2 = 15^2 ), find missing side"]