At Southside Middle School, 20% of the students play an instrument. There are 305 students. How many students play an instrument
2 answers:
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Answer:
Last option; x = 1 or x = -5
Step-by-step explanation:
1. Simplify the equation.
Step 1: Add 7 to both sides.
Step 2: Divide both sides by 4.
2. Now that we simplified the equation to this, we have to solve for absolute value. We know either or
.
3. (Solving for 1st possibility)
Step 1: Subtract 4 from both sides.
Step 2: Divide both sides by 2.
4. (Solving for 2nd possibility)
Step 1: Subtract 4 from both sides.
Step 2: Divide both sides by 2.
5. Now that we have the outcomes of both of our possibilities as x = 1 or x = -5, the last option matches with what we got.
Answer:
x= -4
x= 4
Step-by-step explanation:
This is a quadratic equation, and can be solved very quickly since it only has two terms, the square one and the free term.
Hence the solutions is obtained following the steps from below:
x2-16=0
Lets sum to both side 16
x2-16=0+16
x2=16
Now, lets apply square root to whole equation:
The bars means that x can be-4 o 4, since -4^2=16 and 4^2=16