Bonsoir,
1. [tex]3x(5-2x)=15x-6x^2\\[/tex]
2. [tex](7x-1)(2x+1)-(2x-1)=14x^2+7x-2x-1-2x+1=14x^2+3x[/tex]
3. [tex]4a(2a+3)-5(3a-2)=8a^2+12a-15a+10=8a^2-3a+10[/tex]
4. [tex]3t^2-(5t+2)(2t-1)=3t^2-(10t^2-5t+4t-2)=3t^2-10t^2+5t-4t+2\\=-7t^2+t+2[/tex]
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Bonsoir,
1. [tex]3x(5-2x)=15x-6x^2\\[/tex]
2. [tex](7x-1)(2x+1)-(2x-1)=14x^2+7x-2x-1-2x+1=14x^2+3x[/tex]
3. [tex]4a(2a+3)-5(3a-2)=8a^2+12a-15a+10=8a^2-3a+10[/tex]
4. [tex]3t^2-(5t+2)(2t-1)=3t^2-(10t^2-5t+4t-2)=3t^2-10t^2+5t-4t+2\\=-7t^2+t+2[/tex]