Question

Find the value of x. (5x+15) (6x-10)

Answer 1

(5x+15)(6x-10)
= 30x^2 + 30x - 50x - 150
= 30x^2 - 20x - 150

Answer 2

We get x = -5/3 and x = -3

Explanation:

`(5x+15) (6x-10)`

Multiplying this and equating to zero, to find x.

`30x^(2) -50x+90x-150=0`

`30x^(2) +40x-150=0`

Factoring out 10.

`3x^(2) +4x-15=0`

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

3x(x+3)-5(x+3)=0
`</p><p>[tex](3x-5)(x+3)=0`[/tex]

We get x = -5/3 and x = -3