Question

(3-5x)(3+5x)=2x(x+9)+9

Answer 1

(3 - 5x)(3 + 5x) = 2x(x + 9) + 9
9 + 15x - 15x - 25x² = 2x² + 18x + 9
15x - 15x - 25x² - 2x² - 18x = 9 - 9
-27x² - 18x = 0 (*-1)(:9)
3x² + 2x = 0
x(3x + 2) = 0

x = 0

3x + 2 = 0
3x = -2
x = -2/3

Solução: {0; -2/3}

BONS ESTUDOS!

Answer 2

(3-5x)(3+5x)=2x(x+9)+9

9 + 15x - 15x - 25x² = 2x² + 18x + 9

9 - 25x² = 2x² + 18x + 9

- 25x² - 2x² + 18x + 9 - 9 = 0

- 27x² + 18x = 0

9x • ( - 3x + 2) = 0

x= 0

- 27x + 18 = 0

- 27x = - 18 (-1)

27x = 18

x= 18/27 (÷ 9)

x= 2/3

S= ( 2/3 , 0)