Which answer is a solution to the open sentence? 6< 3b or 3b+12< 9

6 < 3b OR 3b + 12 < 9

2< b Or 3b < -3  You only change the sign if you multiply or divide a negative number.

2 < b OR b < 1  that means b > 2

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step-by-step explanation:

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answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!