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Find the value of x if 3x2 - 1 = 27/3-3x A. 4, -1 B. 4, 1 ...
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find the value of x if 3x2 - 1 = 27/3-3x

A. 4, -1

B. 4, 1

C. -4, -1

D. 4, 1

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peter
Asked by peterrep:1.6K
University of Lagos Nigeria
11 May 2020

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james_mark
James_mark answeredrep:694
School not set Nigeria
19 July 2020
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from indices,

3x2 - 1 = 33/3-3x

x2 - 1 = 3 - (-3x)

x2 - 1 = 3 + 3x

x2 - 1 - 3 - 3x = 0

x2 - 3x - 4 = 0

from factorization method of solving quadratic equation

x2 - 4x + x - 4 = 0

(x2 - 4x) + (x - 4) = 0

x(x - 4) + 1(x - 4) = 0

(x + 1) (x - 4) = 0

x + 1 = 0

x - 4 = 0

x = -1, 4

Ans A

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