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avatar+673 

For what values of x does x^2 +10x + 2 = 0?

 

A) -10 ± 2 √23

 

B) 5 ± √23

 

C) 5 ± 2 √6

 

D) -5 ± 2 √6

 

E) -5 ± √23

 

 

 

 

At what value(s) is √x + 3 undefined?

 

A) (-∞, -3)

B) (-∞, -3]

C) (-∞, 3)

D) (-∞, 3]

E) [-3, ∞)

 

 

 

 

 

 

Which expression best represents the perimeter of this rectangle? 

 

[Recall that perimeter equals the total length of the sides.]

 

A) L 2^W^2

B) 2LW

C) 4LW

D) 2(LW)

E) 2L + 2W

 Aug 28, 2019
 #1
avatar+103148 
+2

x^2 + 10x + 2  =  0

 

x^2  + 10x    =   - 2

 

Complete the square on x

 

x^2 + 10x + 25   =  -2 + 25

 

(x + 5)^2  =  23    take both roots

 

x + 5  =  ±√23

 

x  =  -5  ±√23

 

 

 √[x + 3]     we cannot have a negative under the radical....so...undefined for  (-inf, -3 ) ⇒  A

 

 

Perimeter =   2L + 2W

 

 

cool cool cool

 Aug 28, 2019

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