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vovasya140500
@vovasya140500
July 2022
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Решить уравнение √(2x+1)+√x=5
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zhenyaM2002
Verified answer
√(2х +1) + √х = 5
√(2х + 1)≥0 ; √х ≥0
√(2х +1) = 5 -√х
(√(2х +1) )² = (5 - √х)²
2х + 1 = 5² - 2*5*√х + (√х)²
2х + 1 = 25 - 10√х + х
2х +1 - 25 - х = - 10√х
х - 24 = - 10√х
(х -24)² = (-10√х)²
х² - 2*х *24 + 24² = 100х
х² - 48х +576 - 100х =0
х² - 148х + 576 =0
D= (-148)² - 4*1*576 = 21904 - 2304=19600=140²
x₁ = (148 - 140)/2 = 8/2 = 4
x₂= (148+140)/2 = 288/2=144 посторонний корень
(√(2*144+1) + √144 = 17 + 12 = 29 ≠ 5)
Ответ: х = 4.
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Answers & Comments
Verified answer
√(2х +1) + √х = 5√(2х + 1)≥0 ; √х ≥0
√(2х +1) = 5 -√х
(√(2х +1) )² = (5 - √х)²
2х + 1 = 5² - 2*5*√х + (√х)²
2х + 1 = 25 - 10√х + х
2х +1 - 25 - х = - 10√х
х - 24 = - 10√х
(х -24)² = (-10√х)²
х² - 2*х *24 + 24² = 100х
х² - 48х +576 - 100х =0
х² - 148х + 576 =0
D= (-148)² - 4*1*576 = 21904 - 2304=19600=140²
x₁ = (148 - 140)/2 = 8/2 = 4
x₂= (148+140)/2 = 288/2=144 посторонний корень
(√(2*144+1) + √144 = 17 + 12 = 29 ≠ 5)
Ответ: х = 4.