Question

C. (5x + 8) (5x – 8)= D. (6x + 2y) (6x – 2y)= E. (10 a + 3) (10 a – 3)= F. (x + ⅓) (x - ⅓)=

Answer 1

Oie, Td Bom?!

• Desenvolva as expressões usando:

$(a - b)(a + b) = a {}^{2} - b {}^{2}$

C)

$= (5x + 8) \: . \: (5x - 8) \\ = (5x) {}^{2} - 8 {}^{2} \\ = 25x {}^{2} - 64$

D)

$= (6x + 2y) \: . \: (6x - 2y) \\ = (6x) {}^{2} - (2y) {}^{2} \\ = 36x {}^{2} - 4y {}^{2}$

E)

$= (10a + 3) \: . \: (10a - 3) \\ = (10a) {}^{2} - 3 {}^{2} \\ = 100a {}^{2} - 9$

F)

$= (x + \frac{1}{2} ) \: . \: (x - \frac{1}{2} ) \\ = x {}^{2} - ( \frac{1}{2} ) {}^{2} \\ = x {}^{2} - \frac{1}{4}$

Att. Makaveli1996