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Paulina
Mathematics
15 November, 15:41
What is the value of x
4x^3+3=867
+4
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Geovanni Oconnor
15 November, 15:42
0
Minus 867 from both sides
4x³-864=0
undistribute 4
4 (x³-216) = 0
factor differnce of 2 perfect cubes
remember that a³-b³ = (a-b) (a²+ab+b²)
so
(4) (x³-6³) = (4) (x-6) (x²+6x+36) = 0
set each to 0
x-6=0
x=6
x²-6x+36=0
no real numbers will work for x
x=6
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Izabelle Kirby
15 November, 15:48
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Isolate the x:
4x^3 = 864,
x^3 = 216
x = 6
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