Question

Show that x= -3 is a secretion of 2x^2 + 5x-3=0​

Answer 1

$2 {x}^{2} + 5x - 3 = 0 \\ \\ if \: \: x \: \: = \: \: - 3 \: \: then \: \: \\ (2 \times - 3 \times - 3) + (5 \times - 3) + ( - 3) = 0 \\ 18 - 15 - 3 = 0 \\ + 18 - 18 = 0 \\ 0 = 0 \\ \\ hence \: \: verified \: \:$