Their are two solutions.
X = -2/7 = 0.286
X = 1
<span>21-3y=36-6y +3y
21 = 36 - 3y -36
-36+21 = -3y
- 15 = - 3y ÷ -3
5 = y
Choice: B
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Answer:
Step-by-step explanation:
mean- 62
Hey there,
10
:1s=1260
:x
Which means that we would do x=1260 x 1s÷10
Which would include to be
x=126s_____________________________________________________________
Hope this helps.
~Jurgen
<span><span> x2-15=0</span> </span>Two solutions were found : <span> x = ± √<span>15 </span>= ± 3.8730</span>
Step by step solution :<span>Step 1 :</span>Trying to factor as a Difference of Squares :
<span> 1.1 </span> Factoring: <span> x2-15</span>
Theory : A difference of two perfect squares, <span> A2 - B2 </span>can be factored into <span> (A+B) • (A-B)
</span>Proof :<span> (A+B) • (A-B) =
A2 - AB + BA - B2 =
A2 <span>- AB + AB </span>- B2 =
<span> A2 - B2</span>
</span>Note : <span> <span>AB = BA </span></span>is the commutative property of multiplication.
Note : <span> <span>- AB + AB </span></span>equals zero and is therefore eliminated from the expression.
Check : 15 is not a square !!
Ruling :<span> Binomial can not be factored as the difference of two perfect squares.
</span>
<span>Equation at the end of step 1 :</span><span> x2 - 15 = 0
</span><span>Step 2 :</span>Solving a Single Variable Equation :
<span> 2.1 </span> Solve : <span> x2-15 = 0</span><span>
</span>Add 15 to both sides of the equation :<span>
</span> <span> x2 = 15</span>
<span>
</span>When two things are equal, their square roots are equal. Taking the square root of the two sides of the equation we get: <span>
</span> x = <span> ± √<span> 15 </span></span><span>
</span>The equation has <span>two real solutions <span>
</span></span>These solutions are <span> x = ± √<span>15 </span>= ± 3.8730 </span><span>
</span>
Two solutions were found : <span> x = ± √<span>15 </span>= ± 3.8730</span>