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F00Dislife
19.03.2020 •
Mathematics
State the possible number of positive real zeros, negative realzeros, and imaginary zeros for each function.
13.f(x) = -x^3 - x2 + 14x - 24
14.f(x) = 2x^3 - x^2 + 16x - 5
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Ответ:
In general, y = ax³ + bx² + cx + d
Where a,b,c & d are real,
Y can have at max 3 real roots, or one real and a conjugate pair of complex roots.
Also, -d/a is the product of roots
13) positive real values: 0 or 2
negative real values: 1 or 3
Imaginary roots: 0 or 2
14) positive real values: 1 or 3
negative real values: 0 or 2
Imaginary roots: 0 or 2
Ответ:
A rectangle is a parallelogram with at least one right angle is the best choice ⇒ answer A
Step-by-step explanation:
* Lets revise the properties of the rectangle
# Each two opposite sides are parallel
# Each two opposite sides are equal in length
# Its two diagonals bisect each other and equal each other
# Its four angles are right angles
- The parallelogram can be a rectangle if:
# Two adjacent sides are perpendicular to each other means one
angle of its four angles is a right angle
- OR
# Its two diagonals are equal in length
* Lets solve the problem
- We will study the answers to chose the best one
# Answer A
- A rectangle is a parallelogram with at least one right angle
∵ Each tow opposite angles are equal in the rectangle
∵ One of the is right angle means its measure is 90°
∴ The measure of the opposite angle is also 90°
∵ The sum of the measures of the four angles is 360°
∴ The sum of the measures of the other two angles is;
360 - (90 + 90) = 180°
∵ They are equal to each other (opposite angles)
∴ The measure of each one = 180 ÷ 2 = 90°
∴ The measure of the four angles are 90°
∴ The four angles of the rectangle are right angles
* A rectangle is a parallelogram with at least one right angle is the
best choice