Q. Given the function y=(2x3−1)(3x2−3+x), find dxdy in any form.Answer: dxdy=
Product Rule Explanation: To find the derivative of the given function, we will use the product rule, which states that the derivative of a product of two functions is the derivative of the first function times the second function plus the first function times the derivative of the second function. Let's denote the first function as u(x)=2x3−1 and the second function as v(x)=3x2−3+x.
Derivative of u(x): First, we find the derivative of u(x) with respect to x. The derivative of 2x3 is 6x2, and the derivative of a constant (−1) is 0. So, the derivative of u(x), denoted as u′(x), is 6x2.
Derivative of v(x): Next, we find the derivative of v(x) with respect to x. The derivative of 3x2 is 6x, the derivative of −3 is 0, and the derivative of x is 1. So, the derivative of v(x), denoted as v(x)0, is v(x)1.
Apply Product Rule: Now, we apply the product rule. The derivative of y with respect to x, denoted as dxdy, is given by u′(x)v(x)+u(x)v′(x). Substituting the derivatives we found earlier, we get dxdy=(6x2)(3x2−3+x)+(2x3−1)(6x+1).
Simplify Expression: We now need to simplify the expression. First, we distribute 6x2 across the terms in the first part: (6x2)(3x2)+(6x2)(−3)+(6x2)(x). This simplifies to 18x4−18x2+6x3.
Combine Like Terms: Next, we distribute (2x3−1) across the terms in the second part: (2x3)(6x)+(2x3)(1)−(1)(6x)−(1)(1). This simplifies to 12x4+2x3−6x−1.
Combine Like Terms: Next, we distribute (2x3−1) across the terms in the second part: (2x3)(6x)+(2x3)(1)−(1)(6x)−(1)(1). This simplifies to 12x4+2x3−6x−1.Now, we combine like terms from both parts of the derivative. Adding 18x4 to 12x4 gives 30x4. Adding 6x3 to 2x3 gives 8x3. We already have −18x2. And finally, we combine (2x3)(6x)+(2x3)(1)−(1)(6x)−(1)(1)0 and (2x3)(6x)+(2x3)(1)−(1)(6x)−(1)(1)1. So, the simplified form of the derivative is (2x3)(6x)+(2x3)(1)−(1)(6x)−(1)(1)2.
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