Question

As dori sama ajuta-ti sipe mine la a) (x+1)+(x+2)...+(x+50)=(x+25)totul la a 2 + 25
b) 1+3+...+(2x-1)=100 Va rog ajutati-ma si pe mine

Answer 1

a) [(x+1)(x+50)]*50/2= (2x+51)*25=50x+2550
50x+2550=x²+50x+625+25
2550=x²+650
x²=2550-650
x²=1900
x=10√19