Calculate dy/dx. y= 2(x+7)(x^2-49)

Calculate dy/dx

y = 2(x + 7)(x^2 - 49)
y = (2x + 14)(x^2 - 49)
y = 2x^3 + 14x^2 - 98x - 686

dy/dx = 6x^2 + 28x - 98

multiple out : to get 2x^3-98x+14x^2-689
and differetiait: to get 6x^2-98+28x

y = ( 2x + 14 ) ( x ² - 49 )

dy/dx = 2 ( x ² - 49 ) + (2x) ( 2x + 14 )
dy/dx = 2 x ² - 98 + 4 x ² + 28 x
dy/dx = 6 x ² + 28 x - 98

2(x+7)(x^2-49)
2x^3+14x^2-98x-686
-->6x^2+28x-98