Решите пожалуйста (7х+4)(2х-1)=1. Created by Nata1599. matematika-ru

Решите пожалуйста (7х+4)(2х-1)=1...

VanillaBliss 14x^2 - 7x + 8x - 4 - 1 = 0
14x^2 + x - 5 = 0
D = 1 + 4*14*5 = 281

x1 = (-1 + VD)/28 = (-1 + V281)/28

x2 = (-1 - V281)/28

1 votes Thanks 0

Agetnor $(7x+4)*(2x-1)=1 \\ 14x^{2} -7x+8x-4=1 \\ 14 x^{2} +x-4=1 \\ 14x^{2}+x-5=0 \\ D= 1^{2}-4*14*(-5)=281 \\ x_{1} = \frac{-1+ \sqrt{281} }{2*14} =\frac{-1+ \sqrt{281} }{28} \\ x_{2} = \frac{-1- \sqrt{281} }{2*14} =\frac{-1- \sqrt{281} }{28}$

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