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kasier4600
10.05.2021 •
Mathematics
Rewrite the following quadratic function in vertex form.
f(x) = 6x² + x +4
plz answer asap
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Ответ:
P=2(A/W) + 2W. This is to be minimized.
dP/dW = 2[-A/(W^2)) + 2W. But A = 120 sq in:
dP/dW = 2[-120/(W^2)) + 2W set this equal to 0 and solve for W.
Once you have W, find L: L=120/W
Let 2[-120/(W^2)) + W] = 0. Then [-120/(W^2)) + W] = 0
Multiplying all terms by W^2 gives us -120 + W^3 = 0.
w^3 = 120 cubic inches. Find the cube root to find W.
W = cube root of 120 = 4.93 inches. L = 120/W, or L = 120/4.93 inches
Summary: W = 4.93 inches and L = 24.33 inches (answer)