3(a^2-2ab)-2(-3ab+b^2)

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3(a^2-2ab)-2(-3ab+b^2)3(a^2-2ab)-2(-3ab+b^2)3(a^2-2ab)-2(-3ab+b^2)3(a^2-2ab)-2(-3ab+b^2)=3a^2-6ab+6a

3(a^2-2ab)-2(-3ab+b^2)
3(a^2-2ab)-2(-3ab+b^2)

3(a^2-2ab)-2(-3ab+b^2)
3(a^2-2ab)-2(-3ab+b^2)
=3a^2-6ab+6ab-2b^2
=3a^2-2b^2
=(√3a+√2b)(√3a-√2b)

2(a2+ab-b2)+a2-2ab+b2 =3a -b =3a -3ab+3ab-b =3(a -ab)+(3ab-b ) =3×3+4 =13 2(a^2+ab-b^2)+a^2-2ab+b^2=