Answer:
x [tex]\geq[/tex] 4
Step-by-step explanation:
4x^2 - 64 [tex]\geq[/tex] 0 ; move 64 over
4x^2 [tex]\geq[/tex] 64 ; divide by 4
x^2 [tex]\geq[/tex] 16 ; take square root of both sides
