Ethan made the conjecture 5x - 7 = 13 and x = 4. Which of the following is true to his conjecture? Group of answer choices

True, x = 4

False, x = 5

False, x = -4

False, x = 3

282 6/7 cm^2

step-by-step explanation:

vbbv

step-by-step explanation:

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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