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\left(-k-3\right)^{2}
To find the opposite of k+3, find the opposite of each term.
k^{2}+6k+9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-k-3\right)^{2}.
\left(-k-3\right)^{2}
To find the opposite of k+3, find the opposite of each term.
k^{2}+6k+9
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(-k-3\right)^{2}.