\[{(x-3)}^{2}\]
1
Use Square of Difference: (a−b)2=a2−2ab+b2{(a-b)}^{2}={a}^{2}-2ab+{b}^{2}.
x2−2x×3+32{x}^{2}-2x\times 3+{3}^{2}

2
Simplify  32{3}^{2}  to  99.
x2−2x×3+9{x}^{2}-2x\times 3+9

3
Simplify  2x×32x\times 3  to  6x6x.
x2−6x+9{x}^{2}-6x+9

Done
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