49-2ax - a^2-x^2 factor

49-2ax - a^2-x^2

Extract the negative sign

= 49 - (a^2 + 2ax + x^2)

Factor using a^2 + 2ab + b^2 = (a+b) ^2

= 49 - (a+x) ^2

Factor using a^2 - b^2 = (a-b) (a+b)

= (7 - (a + x)) * (7 + (a + x))

= (7 - a - x) * (7 + a + x)