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Attempt following question by selecting a choice to answer. D
Multiply: [(a + b) + c]^{2}ee DDA. Da^{2}  b^{2} + c^{2} + 2 ab + 2 bc + 2 caB. Da^{2} + b^{2} + c^{2}C. Da^{2} + b^{2} + c^{2} + 2 ab + 2 bc + 2 caD. Da^{2} + b^{2} + c^{2} + 2 ab
D
C
Step 1: [(a + b) + c]^{2}
Step 2: = (a + b)^{2} + 2 (a + b)c + c^{2}[Use special product: (a + b)^{2} = a^{2} + 2ab + b^{2}.]
Step 3: = a^{2} + 2ab + b^{2} + 2 (a + b) (c) + c^{2}[(a + b)^{2} = a^{2} + 2ab + b^{2}.]
Step 4: = a^{2} + 2ab + b^{2} + 2ac + 2bc + c^{2}[Use distributive property.]
Step 5: = a^{2} + b^{2} + c^{2} + 2ab + 2bc + 2ca[Rearrange.]

