Question

упростите выражение
срооооочноооо
20 балов!!!!

Answer 1

$1)\; \; (7a-1)^2+14a=49a^2-14a+1+14a=49a^2+1\\\\2)\; \; 12ab+(6a-b)^2=12ab+36a^2-12ab+b^2=36a^2+b^2\\\\3)\; \; (3a-b)^2-9a^2=9a^2-6ab+b^2-9a^2=b^2-6ab\\\\4)\; \; 4x^2-(2x+1)^2=4x^2-4x^2-4x-1=-4x-1\\\\5)\; \; (5a-1)^2+10a=25a^2-10a+1+10a=25a^2+1\\\\6)\; \; (4+7x)^2-56x=16+56x+49x^2-56x=16+49x^2\\\\7)\; \; 6ab+(3a-2b)^2=6ab+9a^2-12ab+4b^2=9a^2-6ab+4b^2\\\\8)\; \; 49x^2-(2-7x)^2=49x^2-4+28x-49x^2=28x-4$