Step-1

Title: Square roots and cube roots

Grade: 8-a Lesson: S1-L5

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step Type Explanation Answer

1

Problem

Solve for x in the equation: \$ "x" + \sqrt "x" \$ = 6

2

Step

Isolate the square root term:

\$\sqrt "x" = 6 - "x"\$

3

Step

Square both sides to eliminate the square root:

\$(\sqrt "x")^2= (6 - "x")^2\$
\$("x") = (6 - "x")^2\$

4

Step

Expand the right side:

\$ "x" = 36 - 12"x" + "x"^2\$

5

Step

Rearrange terms to set the equation to zero:

\$"x"^2 - 13"x" + 36 = 0\$

6

Step

Factor the quadratic equation:

(x - 4)(x - 9) = 0

7

Step

Find the solutions from the factors:

x = 4 and x = 9

8

Step

Check the solutions by substituting them back into the original equation.For x = 4

\$\sqrt4 + 4 = 2 + 4 = 6\$

9

Step

Check the solutions by substituting them back into the original equation.For x = 9

\$\sqrt9 + 9 = 3 + 9 = 12\$

10

Step

So, the only solution to the equation is x = 4.

11

Choice.A

This option suggests that the solution to the equation \$\sqrt"x" + "x" = 6\$ is x = 12. However, when we substitute x = 12 into the original equation, we get \$\sqrt12 + 12\$, which doesn’t equal 6. Therefore, option A is incorrect

12

12

Choice.B

This option suggests that the solution to the equation \$\sqrt "x" + "x" = 6\$ is x = 8. However, when we substitute x = 8 into the original equation, we get \$\sqrt8 + 8\$, which doesn’t equal 6. Therefore, option B is incorrect

8

13

Choice.C

This option suggests that the solution to the equation \$\sqrt "x" + "x" = 6\$ is x = 6. However, when we substitute x = 6 into the original equation, we get \$\sqrt 6 + 6\$, which doesn’t equal 6. Therefore, option C is incorrect

6

14

Choice.D

This option suggests that the solution to the equation \$\sqrt "x" + "x" = 6\$ is x = 4. When we substitute x = 4 into the original equation, we get \$\sqrt 4 + 4\$, which does indeed equal 6. Therefore, option D is correct solution

4

15

Answer

Option

D

16

Sumup

Can you summarize what you’ve understood in the above steps?


Copyright © 2020-2022 saibook.us Contact: info@saibook.us Version: 1.5 Built: 07-May-2024 09:20AM EST