(1-6y).(1+6y)=
(2r-3s)²=
(1+2ab)²=
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= 1+6y-6y-36y²= 1-36y²
=4r²-6rs-6rs+9s²= 4r²-12rs+9s²
= 1+2ab+2ab+4a²b²= 1+4ab+5a²b²
=4r²-6rs-6rs+9s²= 4r²-12rs+9s²
= 1+2ab+2ab+4a²b²= 1+4ab+5a²b²
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