Question

1+2ab-a²-b² factorise the equation​

Answer 1

Answer:

(1-a-b)(1+a+b)

Step-by-step explanation:

1+2ab-a^2-b^2

=1-(2ab+a^2+b^2)

=1-(a+b)^2

=1-(a+b) 1+(a+b)

=(1-a-b)(1+a+b)

Answer 2

Answer:

1‐(a^2+b^2‐2ab)

= 1‐(a‐b)^2

(1‐a+b)(1+a‐b)