Evaluate $9$9$($($\left|1\right|$|1|$)$).
Add $\left|49\right|$|49| and $\left|-6\right|$|−6|.
Simplify $-\left|-90\right|$−|−90|.
Simplify $\left|-\left(-25\right)\right|$|−(−25)|.
Identities (a ± b)^2 = a^2 ± 2ab + b^2, a^2 – b^2 = (a – b) (a + b) Factorisation (simple cases only) as examples the following types a(x + y), (x ± y)^2, a^2 – b^2, (x + a).(x + b)