Simplify the expression -4x2(3x − 7).

-12x^3+28x^2

Step-by-step explanation:

-4x3= -12

-4x-7= 28

x^2+x= x^3

Then, x^2 just transfers over beside 28.

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step-by-step explanation:

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step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2