Question

mais uma q preciso :) :)

Answer 1

a
5y² - 3y = 0
y( 5y - 3 ) = 0
y = 0 ***
5y - 3 = 0
5y = 3
y = 3/5 ****
b
7x² - 35x = 0
x² - 5x = 0
x ( x - 5 ) = 0
x = 0
x - 5 = 0
x = 5 ****
c
4x²/3 + 5x = 0
mmc = 3
4x² + 15x = 0
x( 4x + 15 ) = 0
x = 0 ***
4x + 15 = 0
4x = -15
x = -15/4 ***
d
7 ( t + 2)² / 2 = 14/1
Nota ( t + 2 )² = t² + 2 * t * 2 + 2²  = t² + 4t + 4
7 ( t² + 14t + 4)/2 = 14/1
( 7t² + 98t + 28)/2 = 14/1
7t² + 98t + 28 = 28
7t² + 98t + 28 - 28 = 0
7t² + 98t = 0
t² + 14t = 0
t( t + 14 ) = 0
t = 0 ***
t + 14 = 0
t = -14 ****
e
( x - 6)² = 2( x + 18 )
nota ( x - 6)² = x² - 2 * x * 6 + 6² = x² -12x + 36
x² - 12x + 36 = 2x - 36
x² -  12x + 36 - 2x + 36 = 0
x² -14x + 72 = 0
delta = 196 - 288 = -92 não há raizes no campo real delta <0

Answer 2

-92 espero ter te ajudado