exam Maths Puzzle Numerical Ability

b to the power of 2 minus 2bc+c to the power of 2=

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Please help me!!!
1. You have 10 feet of yarn to use for making bracelets and necklaces. You need 1 foot for each bracelet and 2 feet for each necklace.

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Identify the vertex for the graph of y=4(x+3)^2+4