Question

factorise 1) 1-x²-y²-2xy
2) a⁴-a​

Answer 1

Answer:

1) 1 -(x + y) whole square       2) a(a cube - 1)

Step-by-step explanation:

1) 1-x square - y square - 2xy

= 1-(x square + y square + 2xy)

[x square + y square + 2xy = (x + y) whole square]

=1-(x + y) whole square

2) a power 4 - a

a cube × a - a × 1

a(a cube - 1)