Respuesta :
Answer:
8
Step-by-step explanation:
To subtract polynomials, subtract like terms:
(15x²+11y²+8x)-(7x²+5y²+2x)
Like terms are those terms with the same variables and exponents.
15x² and 7x² are like terms; 15x²-7x² = 8x²
This is the missing coefficient in the answer.