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If (x + 2)(3x^2 + x + 5) = Ax^2 + Bx^2 + Cx + D, what is the value of A + B - C - D?

 Feb 16, 2021
 #1
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(x + 2)(3x2 + x + 5)

= 3x3 + x2 + 5x + 6x2 + 2x + 10

= 3x+ 7x2 + 7x + 10

 

A = 3 

B = 7

C = 7

D = 10

 

A + B - C - D

= 3 + 7 - 7 - 10

= 10 - 17

= -7, which is your answer :)

 Feb 16, 2021

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