\[-b(5a-b)\]
1
Expand by distributing terms.
−b×5a−b×−b-b\times 5a-b\times -b

2
Regroup terms.
−5ba−b×−b-5ba-b\times -b

3
Use Product Rule: xaxb=xa+b{x}^{a}{x}^{b}={x}^{a+b}.
−5ba−(−b2)-5ba-(-{b}^{2})

4
Remove parentheses.
−5ba+b2-5ba+{b}^{2}

Done
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