Answer: -2ab² + 2ab - 2a
Step-by-step explanation:
-2(a + b[3a - a(4 - b)])
= -2(a + b[3a - 4a + ab]) distributed -a into (4 - b)
= -2(a + b[-a + ab]) simplified inner brackets
= -2(a - ab + ab²) distributed b into (-a + ab)
= -2a + 2ab - 2ab² distributed -2 into (a - ab + ab²)
