РЕШИТЕ УРАВНЕНИЕ 1.Х²-49Х=02.4Х²=(2Х+1)²+3Х²-5

Question

РЕШИТЕ УРАВНЕНИЕ


1.Х²-49Х=0
2.4Х²=(2Х+1)²+3Х²-5

Answer 1

X^2 - 49x = 0
x(x-49) =0
x=0
или
x=49

4x^2 = ( 2x+1)^2 + 3x^2 - 5
4x^2 = 4x^2 + 4x  +1 + 3x^2 - 5
3x^2 + 4x - 4 = 0
D1 = 4 + 12 = 16 = 4^2
x1 = (-2+4)/3 = 2/3
x2 = (-2-4)/3 = -2