Q. - Let f be a function such that f(2)=−4 and f′(2)=4.- Let g be the function g(x)=2x2.Let G be a function defined as G(x)=g(x)f(x).G′(2)=
Given values: We are given that f(2)=−4 and f′(2)=4. We also know that g(x)=2x2. To find G′(2), we need to use the quotient rule for derivatives, which states that if h(x)=v(x)u(x), then h′(x)=(v(x))2u′(x)v(x)−u(x)v′(x). Here, u(x)=f(x) and v(x)=g(x).
Find g′(x): First, we need to find g′(x). Since g(x)=2x2, we can differentiate it with respect to x to get g′(x)=4x.
Evaluate g′(2): Now we can evaluate g′(2). Substituting x=2 into g′(x)=4x, we get g′(2)=4×2=8.
Apply quotient rule: Next, we apply the quotient rule using the values we have:G′(x)=(g(x))2f′(x)g(x)−f(x)g′(x).We substitute x=2 into the equation to find G′(2):G′(2)=(g(2))2f′(2)g(2)−f(2)g′(2).
Find g(2): We already know that f(2)=−4, f′(2)=4, and g′(2)=8. Now we need to find g(2). Substituting x=2 into g(x)=2x2, we get g(2)=2×22=2×4=8.
Calculate G′(2): Now we have all the values we need to calculate G′(2):G′(2)=(8)2(4×8−(−4)×8).
Simplify numerator: Simplify the numerator: G′(2)=6432+32.
Simplify fraction: Simplify the fraction: G′(2)=6464.
Final result:G′(2)=1.
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