There are no real roots for a negative number, so -81 has no real roots, if the number is 81 however, then the tow roots are 9
BO is double that of DO. In other words, BO is two times longer than DO. The answer is choice B
For example, if DO were 3 units long, then BO would be 6 units long (2*3 = 6). This works because the triangles DCO and BAO are similar triangles. The corresponding sides are in the same ratio or proportion to one another. The larger triangle (BAO) has sides that are twice as long as the smaller triangle's (DCO) corresponding sides.
Side note: we can prove the triangles to be similar using the AA (angle angle) similarity theorem. The first pair of angles are the vertical angles DOC and BOA which are congruent to each other.The second pair is CDB and ABD which are congruent by the alternate interior angle theorem. Check out the attached image for a visual.
Answer:
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Step-by-step explanation:
You need to find the value of the variable "x".
To solve for "x" you need to apply the following property of logarithms:

Apply logarithm on both sides of the equation:

Now, applying the property mentioned before, you can rewrite the equation in this form:

Finally, you can apply the Division property of equality, which states that:

Therefore, you need to divide both sides of the equation by
. Finally, you get:

≈
2x+y-3z=12
2x=4z-y
x=2z-y/2