Pam9iaHarones Pam9iaHarones

17-08-2016
Mathematics

contestada

can you help solve this and provide work? -t (5t-7) =-5

Respuesta :

Panoyin Panoyin

21-08-2016

-t(5t - 7) = -5
-1 -1
t(5t - 7) = 5
t(5t) - t(7) = 5
5t² - 7t = 5
5t² - 7t - 5 = 0
t = -(-7) ± √(-7)² - 4(5)(-5)
2(5)
t = 7 ± √49 - 4(-25)
10
t = 7 ± √49 + 100
10
t = 7 ± √149
10
t = 0.7 ± 0.1√149

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