Question

plz send process and answer

Answer 1

Answer:

(1) 128

Step-by-step explanation:

a³ + 4a - 8 = 0

=> a³ = -4a + 8

=> a⁶ = (a³)² = ( -4a + 8 )² = 16a² - 64a + 64

=> a⁷ = 16a³ - 64a² + 64a

=> a⁷ + 64a² = 16a³ + 64a = 16 ( a³ + 4a ) = 16 × 8 = 128