Question

desenvolva

a) (x + 7)²

b) (y - 3)²

c) (x + 5).(x - 5)

ME AJUDEMMM​

Answer 1

☺ Olá ☺

Vamos desenvolver :

ⓐ $\:{(x + 7)}^{2}$

๏ $\:a = x\:e\:b = 7$

๏ $\:{a}^{2} + 2ab + {b}^{2}$

✯$\:\boxed{\boxed{{x}^{2} + 14x + 49}}$✯

ⓑ $\:{(y - 3)}^{2}$

๏ $\:a = y\:e\:b = 3$

๏ $\:{a}^{2} - 2ab + {b}^{2}$

✯$\:\boxed{\boxed{{y}^{2} - 6y + 9}}$✯

ⓒ $\:(x + 5){•}(x - 5)$

๏ $\:a = x\:e\:b = 5$

๏ $\:{a}^{2} - {b}^{2}$

✯$\:\boxed{\boxed{{x}^{2} - 25}}$✯

Answer 2

Oie, Td Bom?!

a)

$= (x + 7) {}^{2}$

$= x {}^{2} + 2x \: . \: 7 + 7 {}^{2}$

$= x {}^{2} + 14x + 49$

b)

$= (y - 3) {}^{2}$

$= y {}^{2} - 2y \: . \: 3 + 3 {}^{2}$

$= y {}^{2} - 6y + 9$

c)

$= (x + 5) \: . \: (x - 5)$

$= x {}^{2} - 5 {}^{2}$

$= x {}^{2} - 25$

Att. Makaveli1996