Q. If −5−x3−y3=−3x2 then find dxdy at the point (2,−1).Answer: dxdy∣∣(2,−1)=
Differentiate Equation: First, we need to find the derivative of both sides of the equation with respect to x to find dxdy. The equation is −5−x3−y3=−3x2. Differentiate both sides with respect to x, remembering to use the chain rule for the y3 term since y is a function of x. dxd(−5−x3−y3)=dxd(−3x2) This gives us: −3x2−3y2dxdy=−6x
Solve for dxdy: Now, we need to solve for dxdy. −3y^2\left(\frac{dy}{dx}\right) = −6x + 3x^2 Divide both sides by −3y^2 to isolate dxdy. dxdy = \frac{−6x + 3x^2}{−3y^2}
Substitute Point: Next, we substitute the point (2,−1) into the equation to find the value of (dy/dx) at that point.(dy/dx)∣(2,−1)=−3(−1)2−6(2)+3(2)2This simplifies to:(dy/dx)∣(2,−1)=−3−12+12
Calculate Value: Finally, we calculate the value.(dxdy)∣(2,−1)=−30(dxdy)∣(2,−1)=0
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