Answer
$20x+28y-12$
Work Step by Step
RECALL
The distributive property states that for any real numbers a, b, c, and d:
$a(b-c+d)=ab-ac+ad$
Use the distributive property by multiplying $4$ to each term of the trinomial factor to obtain:
$=4(5x) - 4(3) + 4(7y)
\\=20x-12+28y
\\=20x+28y-12$