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Supposed to solve using the Substitution Method.
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8(5-z)^2-14(5-z)+3=0.......(1)
Let 5-z=t, substitute 5-z=t in equation (1),we then have:
8t^2-14t+3=0
8t^2-12t-2t+3=0
4t(2t-3)-1(2t-3)=0
(4t-1)(2t-3)=0
Thus t=1/4 or 3/2
since z=5-t;
Therefore, z=19/4 or 7/2
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