Question

Solve 4r2 – 5 = 59

{± 3}


{± 4}


{± 5}


{±6}

Answer 1

9514 1404 393

Answer:

(b) ±4

Explanation:

4r^2 -5 = 59 . . . . given

4r^2 = 64 . . . . . . . add 5

r^2 = 16 . . . . . . . . . divide by 4

r = ±4 . . . . . . . . . . . take the square root