Question

Show that x=-4 is a sloution of 3x²+13x+4=0

Answer 1

Hope it helps you...

Answer 2

$x = - 4$

$3 {x}^{2} + 13x + 4 = 0$

$3 \times - 4 \times - 4 + 13 \times - 4 + 4 = 0$

3×-8+13=0
3×5=0
15=0
=0