a) \(x^2-10x+25-36\)
\(=\left(x-5\right)^2-6^2\)
\(=\left(x-5+6\right)\left(x-5-6\right)=\left(x+1\right)\left(x-11\right)\)
b) \(2x^2+22\)
\(=2\left(x^2+11\right)\)
a) C1: x2 - 10x - 11 = (x2 - 2.x.5 + 25) - 36
= (x - 5)2 - 62
= (x - 11)(x + 1)
C2: x2 - 10x - 11 = x2 + x - 11x - 11
= x(x + 1) - 11(x + 1)
= (x - 11)(x + 1)