Question

R2 square -40r2+256=0 solve this quadratic equation

Answer 1

Answer:

${r}^{2} - 40r + 256 \\ = {r}^{2} - 32r - 8r + 256 \\ = r(r - 32) - 8(r - 32) \\ = (r - 8)(r - 32) \\ = r = 8 \: or \: \: 32$