nymph
nymph
07-04-2015
Mathematics
Answered
A=2b^3-1 what's the value of b if a is 13
Answer :
Panoyin
Panoyin
07-04-2015
A = 2b³ - 1
13 = 2b³ - 1
+ 1 + 1
14
=
2b³
2 2
7 = b³
∛(7) = b
Answer Link
iGreen
iGreen
07-04-2015
[tex]\sf~A=2b^3-1[/tex]
Plug in A = 13
[tex]\sf~13=2b^3-1[/tex]
Add 1 to both sides:
[tex]\sf~14=2b^3[/tex]
Divide 2 to both sides:
[tex]\sf~7=b^3[/tex]
Find the cube root of both sides:
[tex]\sf~b=\sqrt[3]{7}[/tex]
[tex]\sf~b\approx~1.91[/tex]
Answer Link
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