1)3x^2-7x+4=0 2)8x^2-14x+5=0

Question

1)3x^2-7x+4=0
2)8x^2-14x+5=0

Answer 1

Ответ смотри в прикрепленном файле

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Answer 2

1)3x^2-7x+4=0
D = b^2 -4*a*c
D = 7^2 - 4*3*4 = 49-48 =1
D>0
X1 = (-b+√D)/2*a =(7+1)/2*3 = 8/6
X2 = (7-1)/6 = 6/6 = 1

2)8x^2-14x+5=0
D = 14^2 - 4*8*5 = 196-160 = 36
D>0
X1 = (14-√36)/2*8 = (14-6)/16 = 8/16 = 1/2

X2 = (14+6)/16 = 20/16 = 5/4