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Lemur [1.5K]
3 years ago
13

4. Solve. x² – 81 = 0 (1 point) 0 –9 –9, 9 9

Mathematics
2 answers:
astra-53 [7]3 years ago
7 0

Answer:

–9, 9

Step-by-step explanation:

x² – 81 = 0

Add 81 to each side

x² – 81+81 = 0+81

x^2 = 81

Take the square root of each side

sqrt(x^2) = ± sqrt(81)

x = ± 9

Rudik [331]3 years ago
5 0

x^2 - 81 = 0. Add 81 to each side.

x^2 = 81. Take the square root of each side.

x = 9, -9

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we know that
</span>the abscissa<span> and the ordinate are respectively the first and second coordinate of a point in a coordinate system</span>
the abscissa is the coordinate x<span>

step 1
find the midpoint
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</span>ABy------> midpoint AB in the coordinate y
<span>
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the answer is
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see the attached figure

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