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

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ZvpunryFnintr99

Mathematics

Description

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

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Explanation & Answer

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

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Anonymous
I was struggling with this subject, and this helped me a ton!

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