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Helenmolima
@Helenmolima
October 2020
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simplifique a expressão:
((a-4)^2)-2(5a-1)-(a-5)(a+5)+(a^2)-20a
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JNMarcos
((a-4)^2)-2(5a-1)-(a-5)(a+5)+(a^2) - 20a
(a^2 - 8a + 16) - 10a + 2 -(a-5)(a+5) + (a^2) - 20a
a^2 - 8a + 16 - 10a + 2 -(a^2 - 25) + (a^2) - 20a
a^2 - 8a + 16 - 10a + 2 - a^2 + 25 + a^2 - 20a
a^2 + a^2 - a^2 - 8a - 10a - 20a + 2 + 25 +16 (aqui, apenas reorganizei o que estava acima)
a^2 -38a + 43
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(a^2 - 8a + 16) - 10a + 2 -(a-5)(a+5) + (a^2) - 20a
a^2 - 8a + 16 - 10a + 2 -(a^2 - 25) + (a^2) - 20a
a^2 - 8a + 16 - 10a + 2 - a^2 + 25 + a^2 - 20a
a^2 + a^2 - a^2 - 8a - 10a - 20a + 2 + 25 +16 (aqui, apenas reorganizei o que estava acima)
a^2 -38a + 43