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[tex]\sf \bold1.) \: \: 3(x^2+7)[/tex]
[tex]\sf \: = 3x {}^{2} + 3 \times 7[/tex]
[tex]\sf \: = \boxed{\bold{3 {x}^{2} + 21 }}[/tex]
[tex]\sf \bold 2.) \: \: 2s(s-4)[/tex]
[tex]\sf \: = 2s \times s - 2s \times 4[/tex]
[tex]\sf \: = 2 {s}^{2} - 2s \times 4[/tex]
[tex]\sf \: = \boxed{\bold{2 {s}^{2} - 8s}}[/tex]
[tex]\sf \bold 3.) \: (w+7)(w+3)[/tex]
[tex]\sf \: = w \times w + 3w + 7w + 7 \times 3[/tex]
[tex]\sf \: = {w}^{2} + 3w + 7w + 7 \times 3[/tex]
[tex]\sf \: = {w}^{2} + 3w + 7w + 21[/tex]
[tex]\sf \: = \boxed{\bold{w {}^{2} + 10w + 21 }}[/tex]
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