Question

5x
$5x { }^{2} - 4x - 7 = 0$
​

Answer 1

5x²-4x-7= 0

using quadratic formula

a=5 b=-4 c=-7

D = b²-4ac

D = (-4)²-4×5×(-7)

D = 16+140

D = 156

x= -4+√156/10 = -4+2√39/10

x = -4-√156/10= -4+2√39/10

hope it helps you....