Question

Factor: 81x2 - 49

Answer 1

\( \color{Black}{\Rightarrow (9x)^2 - (7)^2}\)

\( \color{Black}{\Rightarrow a^2 - b^2 = (a + b) ( a-b) ; a = 9x,b=7}\)

Answer 2

Factor the GCF and then factor the resulting binomial: 50x3 - 128x