Question

b) (m + 5) • (m – 4) = m + 16'
=
m
+​

Answer 1

$(m + 5) * (m - 4) = m + 16\\m^2 - 4m + 5m - 20 = m + 16\\m^2 + m - 20 = m + 16\\m^2 + m - m - 20 = 16\\m^2 - 20 = 16\\m^2 = 16 + 20\\m^2 = 36\\m = \sqrt{36}\\m = 6$