algebra 2 work ..?

Question

3: 9x + 81x2 = 0
-1/9, 0
-1, 9
-9, 0

11: W2 - 49 = 0
-7
-7, 7
7

17: 10x2 + 21x + 9 = 0
-3/2, -3/5
-3/2
-3/5, 5/2

20: x2 - 12x - 28 = 0
-2, 14
-14, 2
-2/14

13: x2 + 4x + 4 = 0
-2, 2
-2
-4

Answer 1

Hi,


3: 9x + 81x2 = 0
9x(1 + 9x) = 0
9x = 0 so x = 0 and 1 + 9x = 0 so x = -1/9
-1/9, 0 <== answers

11: W2 - 49 = 0
(W - 7)(w + 7) = 0
W - 7 = 0 so W = 7 and w + 7 = 0 so W = -7
-7, 7 <== answers

17: 10x2 + 21x + 9 = 0
(2x + 3 ) (5x + 3) = 0
2x + 3 = 0 so x = -3/2 and 5x + 3 = 0 so x = -3/5
-3/2, -3/5 <=== answers

20: x2 - 12x - 28 = 0
(x - 14)(x + 2) = 0
x - 14 = 0 so x = 14 and x + 2 = 0 so x = -2
-2, 14 <== answers

13: x2 + 4x + 4 = 0
(x + 2)(x + 2) = 0
x + 2 = 0 so x = -2 for both factors
-2 <== answer


I hope that helps!! :-)

Answer 2

Show the exponents.

9x + 81xx = 0
9x(1 + 9x) = 0
x = 0

1 + 9x = 0
9x = -1
x = -1/9



WW - 49 = 0
WW = 49
W = -7 or 7



10xx + 21x + 9 = 0


xx - 12x - 28 = 0
(x + 2)(x - 14) = 0
x = -2 or +14


xx + 4x + 4 = 0
(x + 2)(x + 2) = 0
x = -2

Answer 3

9x + 81x² = 0

9x(1 + 9x) = 0

- - - - - - - - -

w² - 49 = 0

(w - 7)(w + 7)

- - - - - - - - - - -

10x² + 21x + 9 = 0

10x² + 15x + 6x + 9 = 0

5x(2x + 3) + 3(2x + 3) = 0

(5x + 3)(2x + 3) = 0

- - - - - - - - - -s-