Question

Help me please and have a good day

Answer 1

D)
`x = (8)/(3) \: or \: x = - (5)/(2)`

Explanation:

`6 {x}^(2) - x - 40 = 0 \\ 6 {x}^(2) - 16x + 15x - 40 = 0 \\ 2x(3x - 8) + 5(3x - 8) = 0 \\ (3x - 8)(2x + 5) = 0 \\( 3x - 8)(2x + 5) = 0 \\ 3x - 8 = 0 \: \: \: \: or \: \: \: 2x + 5 = 0 \\ x = (8)/(3) \: \: \: or \: \: \: x = - (5)/(2)`