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BartSMP [9]
3 years ago
8

One of the solutions to x^2-2x-15=0 is x=-3. What is the other solution?

Mathematics
2 answers:
nikitadnepr [17]3 years ago
6 0
X=5 because the factored form of the equation is (x-5)(x+3)=0 so if u set both of these equal to 0, then the other solution is 5. 
fiasKO [112]3 years ago
5 0

Answer:

Other solution of the equation is x = 5

Step-by-step explanation:

Given Quadratic Equation,

x^2-2x-15=0

One of the solution of the given quadratic equation is x = -3

To find: 2nd solution of the equation.

We solve the given equation using middle term split method.

Consider,

x^2-2x-15=0

x^2-5x+3x-15=0

x ( x - 5 ) + 3 ( x - 5 ) = 0

( x - 5 )( x + 3 ) = 0

x - 5 = 0 ⇒ x = 5

x + 3 = 0 ⇒ x = -3

Therefore, Other solution of the equation is x = 5

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Find all the critical values
Natalija [7]
              y - 3
g(y) = ------------------
            y^2 - 3y + 9

To find the c. v., we must differentiate this function g(y) and set the derivative equal to zero:
     
             (y^2 - 3y + 9)(1) - (y - 3)(2y - 3)
g '(y) = --------------------------------------------
                    (y^2 - 3y + 9)^2

Note carefully:  The denom. has no real roots, so division by zero is not going to be an issue here.  

Simplifying the denominator of the derivative, 

(y^2 - 3y + 9)(1) - (y - 3)(2y - 3)  =>  y^2 - 3y + 9 - [2y^2 - 3y - 6y + 9], or
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Setting this result = to 0 produces the equation y(-y + 6) = 0, so
y = 0 and y = 6.  These are your critical values.  You may or may not have max or min at one or the other.
6 0
3 years ago
Which choice includes all of the solutions to 2x2 + x – 3 = 0 by factoring
KonstantinChe [14]

Answer:either c or b

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A: Commutative Property of Addition

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4 years ago
What is the gradient of the line that passes through the points (0,0) and (7,28)?
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3 years ago
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denis23 [38]
Answer:

2x + 3 = 9

Step-by-step explanation:

Three more than twice a number is nine

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And is means equal sign or “=“
6 0
3 years ago
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