(A+2B)^2=? A-2B=7,AB=3
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(A+2B)^2=? A-2B=7,AB=3
(A+2B)^2=? A-2B=7,AB=3
(A+2B)^2=? A-2B=7,AB=3
A-2B=7,AB=3
(A+2B)^2=A^2+4AB+4B^2=(A^2-4AB+4B^2)+8AB=(A-2B)^2+8AB
=7^2+8*3=73
(A+2B)^2=? A-2B=7,AB=3
(A+2B)^2=? A-2B=7,AB=3
(A+2B)^2=? A-2B=7,AB=3
A-2B=7,AB=3
(A+2B)^2=A^2+4AB+4B^2=(A^2-4AB+4B^2)+8AB=(A-2B)^2+8AB
=7^2+8*3=73