Question

please solve this question​

Answer 1

Step-by-step explanation:

$(1+7x)^2+(49x^2-1)\\=(1+7x)^2 + [(7x)^2 - (1)^2]\\=[(1+7x)(1+7x)] + [(7x+1)(7x-1)]\\=(7x+1)[(1+7x)+(7x-1)]\\=(7x+1)(14x)\\=(14x)(7x+1)$

Hence, 14x is the factor of $(1+7x)^2+(49x^2-1)$