0.08 cm/min
Step-by-step explanation:
Given:
Find when diameter D = 20 cm.
We know that the volume of a sphere is given by
Taking the time derivative of V, we get
Solving for , we get
Use factoring to solve the quadratic equation. Check by substitution or by using a graphing utility and identifying x-intercepts
1 answer:
9514 1404 393
Answer:
x = -7, x = 9
Step-by-step explanation:
We presume your equation is ...
x² -2x -63 = 0
Factors of -63 that have a sum of -2 are -9 and +7. Then the factored equation is ...
(x -9)(x +7) = 0
Solutions make the factors zero.
x -9 = 0 ⇒ x = 9
x +7 = 0 ⇒ x = -7
The solutions to the quadratic equation are x = -7 and x = 9.
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