Решите уравнение, плиз) (3x+5)*5x:50=7²-14

Question

Решите уравнение, плиз)
(3x+5)*5x:50=7²-14

Answer 1

( 3х + 5 ) • 5х : 50 = 7^2 - 14
( 3х + 5 ) • 5х = 50 • ( 49 - 14 )
5х( 3х + 5 ) = 50 • 25
15x^2 + 25x - 1250 = 0
5( 3x^2 + 5x - 250 ) = 0
D = 25 + 3000 = 3025 = 55^2
X1 = ( - 5 + 55 ) : 6 = 25/3 = 8 1/3
X2 = ( - 5 - 55 ) : 6 = - 10
О да 8 1/3 ; - 10