exam Maths Puzzle Numerical Ability

Please help me with this equation: b2-2bc+c2

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exam Other Question

I am not sure I am solving this problem correctly could you please explain it to me? Simplify the complex fraction:

w+3/4w / w-3/2w

Thank you for your help. Sketch the angle with measure (-2π)/3 radians. Then label its reference angle.

Thanks