Please help it’s really important and due rlly soon I’ll give brainliest and everything but please help!

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

26) -2(7x) = (-2 • 7) x a. associative property of addition b. associative property of multiplication c. commutative property of multiplication d. commutative property of addition

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