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gogolik [260]
3 years ago
6

How do you do this problem? Solve by factoring or finding square roots. x^2-1=0

Mathematics
2 answers:
sp2606 [1]3 years ago
4 0
X² - 1 = 0
<u>   + 1  + 1</u>
      x² = 1
       x = <u>+</u>1
Serga [27]3 years ago
3 0
<span>use formula^:   a²-b²= (a-b)(a+b)
x²-1=0</span>
x²-1²=0
(x-1)(x+1)=0
x-1=0⇒ x₁=-1
x+1=0 ⇒x₂=1
Answer: x=+-1
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Step 2

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Step 3

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we know that

cos(BAC)=cos (BAD)=\frac{5}{13}

cos(BAC)=\frac{adjacent\ side }{hypotenuse}=\frac{AB}{AC}

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