Решите уравнение 1) (2х-1)(15+9х)-6х(3х-5)=87 2)(14х-1)(2+х)=(2х-8)(7х+1)

Question

Решите уравнение
1) (2х-1)(15+9х)-6х(3х-5)=87
2)(14х-1)(2+х)=(2х-8)(7х+1)

Answer 1

1) (2x - 1)( 15 + 9x) - 6x(3x - 5) = 87
30x + 18x² - 15 - 9x - 18x² + 30x = 87
60x - 9x = 87 + 15
51x = 102
x = 102/51
x = 2

2) (14x - 1)( 2 + x) = ( 2x - 8)( 7x + 1)
28x + 14x² - 2 - x = 14x² + 2x - 56x - 8
14x² + 27x - 2 = 14x² - 54x - 8
14x² - 14x² + 27x + 54x = - 8 + 2
81x = - 6
x = - 6/81
x = - 2/27

Comments

Спасибо))

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пожалуйста)))

Answer 2

1) (2x - 1)( 15 + 9x) - 6x(3x - 5) = 87
30x + 18x² - 15 - 9x - 18x² + 30x = 87
60x - 9x = 87 + 15
51x = 102
x = 102/51
x = 2
;)

Comments

: )