Question

RESPOSTA URGENTE, PLZZZZ

A) x2 + 10x + 25 = 0

B) x2 - 10x + 21 = 0

C) 3x2 - 2x - 1 = 0

D) 10x2 + 7x + 1 = 0

Answer 1

a) x2 + 10x + 25 = 0

$\times = - \frac{25}{12}$

$2x \: + 10x \: + 25 = 0$

$2x \: + \: 10x = - 25$

b) ×2 - 10× +21 = 0

$2 x - 10 x + 21 = 0$

$2x - 10 x = - 21$

$- 8x = - 21$

$\times = - 21 \div ( - 8)$

$\times = 2.625$

c)3×2 - 2× - 1 = 0

$6 - 2 \times - 1 = 0$

$- 2 \times = - 6 + 1$

$\times = - 5 \div ( - 2)$

$\times = 2.5$

D) 10x 2 + 7× + 1= 0

$20 + 7 \times + 1 = 0$

$7x = - 20 - 1$

$7 \times = - 21$

$\times = - 21 \div 7$

$\times = - 3$