Write this trinomial in factored form.
5b^2-b-4

(5b + 4)(b - 1).

Step-by-step explanation:

5b^2 - b - 4         (- 4 * 5 = -20  and  -5b + 4b = -b so we have:

= 5b^2 - 5b + 4b - 4

= 5b(b - 1) + 4(b - 1)

=  (5b + 4)(b - 1).

hello from mrbilldoesmath!

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!

$15.40 per mile

step-by-step explanation:

you have to round up to 4 because 6 is over 5 so you have to round the 3 up to 4