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The slope of the tangent to the curve y=...

The slope of the tangent to the curve `y=x^(3)+x+54` which also passes through the originis

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To find the slope of the tangent to the curve \( y = x^3 + x + 54 \) that passes through the origin, we can follow these steps: ### Step 1: Differentiate the function We start by finding the derivative of the curve, which gives us the slope of the tangent line at any point \( x \). \[ \frac{dy}{dx} = \frac{d}{dx}(x^3 + x + 54) \] ### Step 2: Apply the power rule Using the power rule of differentiation, we differentiate each term: \[ \frac{dy}{dx} = 3x^2 + 1 + 0 = 3x^2 + 1 \] ### Step 3: Set up the equation for the tangent line The slope of the tangent line at a point \( (x_0, y_0) \) on the curve is given by \( m = 3x_0^2 + 1 \). Since the tangent line passes through the origin (0,0), we can express the equation of the tangent line using point-slope form: \[ y - y_0 = m(x - x_0) \] ### Step 4: Substitute \( y_0 \) and \( m \) From the curve equation, we know: \[ y_0 = x_0^3 + x_0 + 54 \] Substituting \( y_0 \) and \( m \): \[ y - (x_0^3 + x_0 + 54) = (3x_0^2 + 1)(x - x_0) \] ### Step 5: Set \( y = 0 \) and \( x = 0 \) Since the tangent line passes through the origin, we set \( y = 0 \) and \( x = 0 \): \[ 0 - (x_0^3 + x_0 + 54) = (3x_0^2 + 1)(0 - x_0) \] ### Step 6: Simplify the equation This simplifies to: \[ -(x_0^3 + x_0 + 54) = -(3x_0^3 + x_0) \] ### Step 7: Rearrange the equation Rearranging gives: \[ x_0^3 + x_0 + 54 = 3x_0^3 + x_0 \] ### Step 8: Combine like terms Combining like terms results in: \[ 54 = 2x_0^3 \] ### Step 9: Solve for \( x_0 \) Dividing both sides by 2: \[ x_0^3 = 27 \] Taking the cube root: \[ x_0 = 3 \] ### Step 10: Find the slope at \( x_0 = 3 \) Now we can find the slope \( m \) at \( x_0 = 3 \): \[ m = 3(3^2) + 1 = 3(9) + 1 = 27 + 1 = 28 \] ### Final Answer The slope of the tangent to the curve that passes through the origin is: \[ \boxed{28} \]
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