Please Solve This, Multiplication Of Polynomials

Please solve this, multiplication of polynomials

 
2. \: (a + 1)( {a}^{2} + 3a + 1) \\ = {a}^{3} + 3 {a}^{2} + a + {a}^{2} + 3a + 1 \\ = {a}^{3} + 4 {a}^{2} + 4a + 1

3. - 2 {b}^{2} (4b + 5) = - 8 {b}^{3} - 10 {b}^{2}

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