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Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

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

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters