Question

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

Answer 1

Answer:

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

Step-by-step 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$[tex](3x-5)(x+3)=0$[/tex]

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

Answer 2

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