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Factoring Videos 19 videos
ACT Math Intermediate Algebra Drill 1, Problem 4. Solve for x based on the equation.
ACT Math Intermediate Algebra Drill 1, Problem 5. Can you simplify the expression?
ACT Math Intermediate Algebra Drill 2, Problem 1. Solve the equation.
SAT Math 8.5 Algebra and Functions 214 Views
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Description:
SAT Math 8.5 Algebra and Functions
Transcript
- 00:02
Buckle up! It's question time.
- 00:05
When you square a certain number, the result is equal to ten times the number plus the number again.
- 00:11
What is the number?
- 00:14
Another equation given to us in words that we have to translate to numbers…
- 00:18
Let’s call the number we’re looking for x.
Full Transcript
- 00:21
Squaring x gives us x squared… …which equals ten times the number…
- 00:25
10x…plus the number again…so PLUS x.
- 00:30
We can write this as the equation x squared equals 11x.
- 00:34
What number squared equals 11 times that number?
- 00:39
We can solve the problem with a little logic. Well…it must be 11…
- 00:42
See how it works. 11 times 11 is 121. 11 squared is 121 and they equal each other.
- 00:49
If we weren’t sure though, x squared is the same as x times x…
- 00:53
…so we can simply divide x from both sides. The correct answer is 11 and we're done!
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