Question

Solve 25x2 – 64 = 0
{64/25}
{8/5}
{-64/25, 64/25}
{-8/5, 8/5}

Answer 1

add 64 to both sides, then divide by 25. you get
x^2=64/25. Take the positive and negative square roots, and you get {-8/5, 8/5}

Answer 2

use\[a^2-b^2=(a+b)(a-b).\]