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# 23 Actions

 Oct10 awarded Notable Question Sep15 awarded Popular Question Jul22 awarded Popular Question Sep21 awarded Custodian Mar22 accepted Prove or disprove: if A is a subset of B and B is not a subset of C, then A is not a subset of C Mar22 accepted How to simplify this square $(3 \times 4 + 2)^2$? Mar22 accepted Can I prove (if $n^2$ is even then $n$ is even) directly? Mar22 accepted How does expanding $(2s+1)^2$ help us prove “$n^2$ even $\implies$ $n$ even”? Mar22 asked How to prove that if $A\cap B' =\varnothing$ then $A \subseteq B$? Mar20 awarded Scholar Mar20 awarded Student Mar20 asked Prove or disprove: if A is a subset of B and B is not a subset of C, then A is not a subset of C Mar12 reviewed Approve Can I prove (if $n^2$ is even then $n$ is even) directly? Mar12 asked Can I prove (if $n^2$ is even then $n$ is even) directly? Mar12 comment How to simplify this square $(3 \times 4 + 2)^2$? I want a rule for $(2s + 1)^2$, too Mar12 asked How to simplify this square $(3 \times 4 + 2)^2$? Mar12 comment How does expanding $(2s+1)^2$ help us prove “$n^2$ even $\implies$ $n$ even”? @Lazar : I think I asked incorrectly, How to solve the square with the variable s? $(2s+1)^2$ step by step because I am confused from where did the 4s came? Mar12 awarded Editor Mar12 comment How does expanding $(2s+1)^2$ help us prove “$n^2$ even $\implies$ $n$ even”? OK, But I am asking about the square: $n^2=(2s+1)^2$ $n^2=2s^2+4s+1$ Mar12 revised How does expanding $(2s+1)^2$ help us prove “$n^2$ even $\implies$ $n$ even”? added 15 characters in body