<PRE><B>Question 1177996</B>


{{{(5(2a-b)-3)(5(2a-b)+3)}}}

{{{(10a-5b-3)(10a-5b+3)}}}

{{{10a*10a-5b*10a+3*10a +10a*(-5b)-5b(-5b)+3(-5b)+10a*(-3)-5b(-3)+3 (-3) }}}

{{{100a^2-50ab+cross(30a) -50ab+25b^2-cross(15b)-cross(30a)+cross(15b)-9 }}}

{{{100a^2-100ab +25b^2-9 }}}

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