Question 207255
.5x^4 -.6x^2 +.7 -2.3x^4 -1.8x +3.9
.
combine  like  terms
.
(.5-2.3)x^4 -.6x^2 -1.8x +(.7+3.9)
.
-1.8x^4 -6x^2 -1.8x +4.6
.