(x+5)^2 को विस्तारित रूप से लिखिये
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(x+5)^2 = x^2+25+10x
{(a+b)^2=a^2+b^2+2ab)}
hence factorise it;
x^2+5x+5x+25=0
x(x+5)+5(x+5)=0
therefore; x= -5,-5
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