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Question

Solve each of the following equations and verify the answer in each case:
2m3+ 8=m2-1

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Solution

2m3 + 8 = m2- 1
or, 2m3 - m2 = -1 -8 [Transposing m/2 to the L.H.S. and 8 to the R.H.S.]
or, 4m-3m6 = -9or, m6 = -9
or, m6×6 = -9×6 [Multiplying both the sides by 6]
or, m = -54
Verification:
Substituting x = −54 on both the sides:

L.H.S.: 2(-54)3 + 8 = -542-1= -1083 + 8 = -36+ 8 = -28 R.H.S.:-542-1 = -27 - 1= -28
L.H.S. = R.H.S.
Hence, verified.

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