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Kipish [7]
3 years ago
5

Below an equation is modeled . What value of x makes this equation true?

Mathematics
1 answer:
Strike441 [17]3 years ago
5 0
5x + 6 = 1
Subtract 6 from both sides.
5x = -5
Divide from both sides.
x = -1 (ANSWER)

hope this helps!!
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Answer:

x = 15

Step-by-step explanation:

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Hello,

y=2^(-x)
y=2^(2x)+3

==>2^(2x)+3=1/2^x
==>2^(3x)+3*2^x-1=0 (1)
Let's assume u=2^x
(1)==>u^3+3*u-1=0

which as 3 roots
u=0.322185354626 or
u = -0.161092677313 + i1.754380959784 or
u = -0.161092677313 - i1.754380959784.

Let's take the real solution

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==>x=ln(0.322185354626) / ln(2)
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an other way is
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f(-2)=1/64+3/4-1=-15/64 <0
f(-1)=1/8+1-1=1/8>0
==> there is a solution betheen -2<x<-1










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