1.Desenvolva o quadrado da soma de dois termos:
a) (a + 7)² =
b) (3x + 1)²=
c) (5 + 2m)=
d) (a + 3x)²
a) (a + 7)² =
b) (3x + 1)²=
c) (5 + 2m)=
d) (a + 3x)²
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A) ( a + 7 ) ² = ( a ) ² + 2. a.7. + ( 7 ) ² = a ² + 14 a + 49b) ( 3x + 1 )² = ( 3x ) ² + 2. 3x . 1 + ( 1 ) ² = 9x² + 6x + 1
c) ( 5 + 2m ) ² = ( 5 ) ² + 2. 5 . 2m + ( 2m ) ² = 25 + 20m + 4 m²
d ) ( a + 3x ) ² = ( a) ² + 2. a . 3x + ( 3x ) ² = a² + 6 ax + 9 x²
b) (3x + 1)²= (3x)² + 2.1.3x + 1² = 9x² + 6x + 1
c) (5 + 2m)² = 5² + 2.5.2m + (2m)² = 25 + 20m + 4m²
d) (a + 3x)² = a² + 2.a.3x + (3x)² = a² + 6ax + 9x²