Answer:

The values of the three quantities A, B and C are 8x2 + 2x - 5,-4x2 + 15 and 15x2 – 3x - 2, respectively.

Determine the sum of the three quantities

A= 8x² + 2x - 5

B= -4x² + 15

C= 15x² – 3x - 2

= (8x² + 2x - 5) + (-4x²+ 15) + (15x² – 3x - 2)

combine the like terms

= 8x² + (-4x²) + 15x² = 19x²

= 2x + (-3x) = -x

= (-5) + 15 + (-2) = 8

ANSWER: 19x²-x+8

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Answer:

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