Verified answer

Subtract:

(0.5x^4 - 0.6x^2 + 0.7) - (2.3x^4 + 1.8x - 3.9)

Answer:

-1.8x^4 - 0.6x^2 - 1.8x + 4.6

(.5x^4 - .6x^2 + .7) - (2.3x^4 + 1.8x - 3.9)

= .5x^4 - .6x^2 + .7 - 2.3x^4 - 1.8x + 3.9

= -1.8x^4 - .6x^2 - 1.8x + 4.6

= (-18x^4 - 6x^2 - 18x + 46)/10

= (-9x^4 - 3x^2 - 9x + 23)/5