Question

Solve: (x + 1)2 = 9
A. -2, 4
B. 2, -4
C. 2, 4
D. 1, -4

Answer 1

@Michele_Laino

Answer 2

hint:
if we take the square root of both sides, we get the subsequent equations:
\[\large \begin{gathered}
x + 1 = 3 \hfill \\
x + 1 = - 3 \hfill \\
\end{gathered} \]
since we have:
\[\sqrt 9 = \pm 3\]

Answer 3

we have to solve those equations

Answer 4

for example, let's consider the first equation:
x+1=3
If I subtract +1 from both sides, I get:
\[\large x + 1 - 1 = 3 - 1\]

Answer 5

what is x?

Answer 6

2?

Answer 7

ok!

Answer 8

that's the first solution.
Now let's consider the second equation:
x+1=-3
again I subtract +1 from both sides, and I get:
\[\large x + 1 - 1 = - 3 - 1\]
what is x?

Answer 9

Oh I just realized that when I pasted the problem it changed the format. (x + 1)^2 = 9 is what it should be. The 2 is an exponent

Answer 10

yes!

Answer 11

Okay?

Answer 12

ok!

Answer 13

SO what next?

Answer 14

what is x, from the second equation?

Answer 15

-4

Answer 16

\[\large x + 1 - 1 = - 3 - 1\]

Answer 17

ok!

Answer 18

so, what is the right option?

Answer 19

2,-4, or B

Answer 20

that's right!

Answer 21

Awesome thanks again!

Answer 22

thanks!