Question

решите уравнение
(20х+80х)•(300-10х)=400

Answer 1

(20х+80х)•(300-10х)=400
100x*(300-10x)=400
x(300-10x)=4
300x-10x²-4=0
5x²-150x+2=0
D=22500-40=22460
√D=2√5615
x1=(150-2√5615)/10=15-0,5√5615
x2=15+0,5√5615