The expression is .
(Commutative Property of Addition: a + b = b + a)
(Distributive property: a(b + c) = ab + bc)
(Add: 7 + 2 = 9)
The simplified expression is .
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(Commutative Property of Addition: a + b = b + a)![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b69b83565033504a6436075c1c89e440.png\")
(Distributive property: a(b + c) = ab + bc)![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=12561fe6960107b18b8f7f7f955326f1.png\")
(Add: 7 + 2 = 9)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
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.