Lovebamagirl12
25.06.2019 •
Mathematics
Solve the equation 9b2 + 30b + 25 = 0. a. b = –5⁄3 b. b = –3⁄5, b = 3⁄5 c. b = –5⁄3, b = 5⁄3 d. b = 5⁄3
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Ответ:
(3b+5)(3b+5)=0
Each factor 3b+5=0 so 3b=-5 so b=-5/3
Check:
9(-5/3)^2+30(-5/3)+25=
9(25/9)-50+25=
25-50+25=0
It checks,
So answer is A.-5/3
Ответ: