Conjugate/Rational Number? Please include a detailed explanation so I can learn to do it by myself, Thank you!

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Step-by-step explanation:

The rationalization of the denominator of the surds are found as follows;

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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

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step-by-step explanation: