Question

помогите пожалуйста пжжж​

Answer 1

$-(x+5)^2+(x-4)^2=4x^2-1\\-(x^2+10x+25)+x^2-8x+16=4x^2-1\\-x^2-10x-25+x^2-8x+16=4x^2-1\\-18x-9=4x^2-1\\-18x-9-4x^2+1=0\\-18x-8-4x^2=0\\9x+4+2x^2=0\\2x^2+9x+4=0\\2x^2+8x+x+4=0\\2x(x+4)+x+4=0\\(x+4)(2x+1)=0\\x+4=0,2x+1=0\\x_{1}=-4,x_{2}=-\frac{1}{2}=-0,5$