Question

Pleaseeeee helppppppp​

Answer 1

$x {}^{2} + 5kx - + 16 = 0$

$a = 1 \\ b = 5k \\ c = 16$

$b {}^{2} - 4ac = 0$

$(5k { }^{2} ) - 4 \times 1 \times 16 = 0$

$25 {k}^{2} - 64 = 0$

$25k {}^{2} = 64$

$k {}^{2} = 64 \div 25$

$k = \sqrt{64 \div 25}$

$k = 8 \div 5$