Answer:
11x^4 - 7x^2 + -3
Step-by-step explanation:
5x^4 -3x^2 + 4 + 6x^4 + - 4x^2 + -7
= 5x^4 + -3x^2 + 4 + 6x^4 + -4x^2 + -7
Combine Like Terms:
= 5x^4 + -3x^ + 4 + 6x^4 + -4x^2 + -7
= ( 5x^4 + 6x^4 ) + ( -3x^2 + -4x^2 ) + ( 4 + -7 )
= 11x^4 - 7x^2 + -3
