Lesson Example Discussion Quiz: Class Homework |
Step-2 |
Title: Equation with two radicals |
Grade: 8-b Lesson: S2-L4 |
Explanation: Hello Students, time to practice and review the steps for the problem. |
Lesson Steps
Step | Type | Explanation | Answer |
---|---|---|---|
1 |
Problem |
Solve \$\sqrt(m + 2) + 1 = \sqrt(3 - m)\$. |
|
2 |
Step |
Write the original equation: |
\$\sqrt(m + 2) + 1 = \sqrt(3 - m)\$ |
3 |
Hint |
Square each side |
\$(\sqrt(m + 2) + 1)^2 = (\sqrt(3 - m))^2\$ |
4 |
Step |
Expand left side and simplify right side |
\$m + 2 + 2\sqrt(m + 2) + 1 = 3 - m\$ |
5 |
Clue |
Isolate radical expression |
\$2\sqrt(m + 2) = -2m\$ |
6 |
Step |
Divide each side by 2 |
\$\sqrt(m + 2) = -m\$ |
7 |
Step |
Square each side |
\$(\sqrt(m + 2))^2 = (-m)^2\$ |
8 |
Step |
Simplify |
\$(\sqrt(m + 2))^2 = (-m)^2\$ \$m + 2 = m^2\$ |
9 |
Step |
Write in standard form and factorize |
\$- m^2 + m + 2 = 0\$ \$(m + 1)(m - 2) = 0\$ m = -1 and m = 2 |
10 |
Step |
Check both solutions in the original equation to ensure they are valid: For m = -1: |
\$\sqrt(m + 2) + 1 = \sqrt(3 - m)\$ \$\sqrt(-1 + 2) + 1 = \sqrt(3 - (-1))\$ \$\sqrt(1) + 1 = \sqrt(4)\$ 2 = 2 |
11 |
Step |
For m = 2: |
\$\sqrt(m + 2) + 1 = \sqrt(3 - m)\$ \$\sqrt(2 + 2) + 1 = \sqrt(3 - 2)\$ \$\sqrt(4) + 1 = \sqrt(1)\$ \$3 ne 1\$ |
12 |
Step |
The apparent solution m = 2 is extraneous. So, the only solution is m = -1. |
|
13 |
Choice.A |
This value satisfies the equation as substituting m=−1 makes both sides equal |
m = -1 |
14 |
Choice.B |
This value does not satisfy the equation as substituting m=−2 results in unequal sides |
m = -2 |
15 |
Choice.C |
This value does not solve the equation correctly, as substituting m=1 yields different values for both sides |
m = 1 |
16 |
Choice.D |
This value fails to satisfy the equation because substituting m=2 does not make both sides equal |
m = 2 |
17 |
Answer |
Option |
A |
18 |
Sumup |
Can you summarize what you’ve understood in the above steps? |
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