Q. If −4=x2+y3−3x then find dxdy at the point (4,−2).Answer: dxdy∣∣(4,−2)=
Implicit Differentiation: To find the derivative dxdy, we need to implicitly differentiate the given equation with respect to x. Given equation: −4=x2+y3−3x Differentiate both sides with respect to x. dxd(−4)=dxd(x2)+dxd(y3)−dxd(3x) Since the derivative of a constant is 0, dxd(−4)=0. The derivative of x2 with respect to x is 2x. For x0, since x1 is a function of x, we use the chain rule: x3. The derivative of x4 with respect to x is x6. Putting it all together, we get: x7.
Solving for dy/dx: Now we need to solve for dxdy.0=2x+3y2⋅(dxdy)−3Rearrange the equation to isolate dxdy on one side:3y2⋅(dxdy)=3−2xDivide both sides by 3y2 to solve for dxdy:dxdy=3y23−2x
Substitution and Calculation: Next, we substitute the point (4,−2) into the equation for dxdy.x=4 and y=−2dxdy=(3(−2)2)(3−2(4))Calculate the values:dxdy=(3⋅4)(3−8)dxdy=(12)(−5)
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