Question

решите уравнение: (5x + 4)(5x - 4) -10(x-2)=4

Answer 1

$(5x+4)(5x-4)-10(x-2)=4,\(5x)^2-4^2-10x+20-4=0,\25x^2-16-10x+16=0,\25x^2-10x=0 |:5,\5x^2-2x=0,\x(5x-2)=0,\\x_1=0,\\5x-2=0,\5x=2,\x_2=frac{2}{5},\x_2=0,4.\\OTBET: x_1=0, x_2=0,4.$