Question

(х+10)в квадрате=(5-х)в квадрате

Answer 1

(x+10)²=(5-x)²
x²+20x+100=25-10x+x²
x²-x²+20x+10x+100-25=0
30x+75=0
30x=-75
x=-75/30=-2.5
Ответ:-2,5

Answer 2

$(x+10)^2=(5-x)^2\\(x+10)^2-(5-x)^2=0\\(x+10-5+x)(x+10+5-x)=0\\(2x+5)cdot 15=0\\2x+5=0\\x=-2,5$