Point Q ′ Q ′ Q, prime is the image of Q ( 3 , − 4 ) Q(3,−4)Q, left parenthesis, 3, comma, minus, 4, right parenthesis under a reflection across the x xx-axis.

Answer:
Q'(3, 4 )
Step-by-step explanation:
Under a reflection in the x- axis
a point (x, y ) → (x, - y ), thus
Q(3, - 4 ) → Q'(3, 4 )