Please answer asap I need help Don't take points or I will report
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Factor the expression using gcf 9b+45

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me