8(5-z)^2 - 15(5-z) + 3

Mathematics
Tutor: None Selected Time limit: 1 Day

I'm supposed to solve this question using the Substitution Method.

Sep 1st, 2015

Thank you for the opportunity to help you with your question!

let 5-z=x

therefore,

8x^2-15x+3=0

x=-b+-sqrt(b^2-4ac)/2a

x=15+sqrt(129)/16           or          x=15-sqrt(129)/16


x=0.2276                        or            x=1.6473 


z=5-0.2276                    or            z=5-1.6473

z=4.7724                       or             z=3.3527

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 1st, 2015

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