Problem

Express as a trinomial.
$(x + 4) (2 x + 9)$

Answer

Expert–verified

Hide Steps

Answer

$2 x^{2} + 9 x + 8 x + 36 = 2 x^{2} + 17 x + 36$

Steps

Step 1 ： $(x + 4) (2 x + 9) = x (2 x + 9) + 4 (2 x + 9)$

Step 2 ： $x (2 x + 9) + 4 (2 x + 9) = 2 x^{2} + 9 x + 8 x + 36$

Step 3 ： $2 x^{2} + 9 x + 8 x + 36 = 2 x^{2} + 17 x + 36$

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