Question

3x square + 4 x minus 15 is equals to zero ​

Answer 1

x = 5/3 or x = -3

Explanation:

3x² + 4x - 15 = 0

Factor left side.

(3x - 5)(x + 3) = 0

Set factors equal to 0.

3x - 5 = 0

3x = 5

x = 5/3

x + 3 = 0

x = -3

Answer 2

x = -3 OR x = 5/3

Explanation:

=>
`3x^2+4x-15 = 0`

Using mid term break formula

=>
`3x^2+9x-5x-15 = 0`

=> 3x(x+3)-5(x+3) = 0

Taking x-3 common

=> (x+3)(3x-5) = 0

Either

x+3 = 0 OR 3x-5 = 0

x = -3 OR x = 5/3