The work shows the first steps for writing a partial fraction decomposition. StartFraction 4 x cubed minus 5 Over (2 x squared + 1) squared EndFraction = StartFraction A x + B Over (2 x squared + 1) EndFraction + StartFraction C x + D Over (2 x squared + 1) squared EndFraction

4 x cubed minus 5 = (A x + B) (2 x squared + 1) + C x + D. 4 x cubed minus 5 = 2 A x cubed + A x + 2 B x squared + B + C x + D

Which equations can be used in a system of equations to solve for the unknowns. Check all that apply.

A = 0
B = 0
D = –5
A + C = 0
2A + 2B = 4

its B, C AND D

Step-by-step explanation:

B) B=0

C) D=-5

D) A+C=0

eg2020

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4