Question

x(2x+5)-7=0 calcule o valor da equaçãoo

Answer 1

x(2x+5)-7=0 
2x + 5x -7=0
7x=7
x= 7/7
x= 1

Answer 2

$x(2x+5)-7=0\\2x^2+5x-7=0\\\Delta=5^2-4.2(-7)\\\Delta=25+56\\\Delta=81$

$x= \frac{-5\pm9}{4}$

$x_1= \frac{-5+9}{4} \\x_1=1$

$x_2= \frac{-5-9}{4}$

$x_2= -\frac{7}{2}$