Resposta:
20x^2
[tex]( + 5x).( + 4x) = \\ ( + 5x) \times ( + 4x) \\ 5x \times (4x) \\ ( + 5x) \times ( + 4x) \\ 5x \times4x \\ 20 \times x \times \\ 5x \times 4x \\ 20x {}^{2} \\ 5x \times 4x \\ 20x {}^{2} \\ resposta \\ 20x {}^{2} [/tex]
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Resposta:
20x^2
[tex]( + 5x).( + 4x) = \\ ( + 5x) \times ( + 4x) \\ 5x \times (4x) \\ ( + 5x) \times ( + 4x) \\ 5x \times4x \\ 20 \times x \times \\ 5x \times 4x \\ 20x {}^{2} \\ 5x \times 4x \\ 20x {}^{2} \\ resposta \\ 20x {}^{2} [/tex]