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Ray Of Light [21]
3 years ago
13

If x=3 what is the value of the expression -2x(2 x^3+3x^2-5x)

Mathematics
1 answer:
aalyn [17]3 years ago
7 0

Answer:

The value would be -396

Step-by-step explanation:

In order to find this, put in 3 for every value of x and then  simplify.

-2x(2 x^3+3x^2-5x)

-2(3)(2(3)^3+3(3)^2-5(3))

-6(2(27) + 3(9) - 15)

-6(54 + 27 - 15)

-6(66)

-396

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3 years ago
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Can you help me write proofs for these, PLEASE!!!
brilliants [131]

Exterior angle theorem and properties of the isosceles triangles are used

prove the specified relations.

Correct responses:

9. ΔPAT ~ ΔPTB by AA similarity postulate

15. \overleftrightarrow{HM}║\overleftrightarrow{JK} by basic proportionality theorem

<h3>Detailed methods used to prove response</h3>

9. A two column proof is presented as follows;

Statement {}                                     Reasons

1. ∠PTA = ∠B {}                           1.  Given

2. ∠PAT = ∠ATB + ∠B  {}           2.  Exterior angle of a triangle theorem

3. ∠BTP = ∠ATB + ∠PTA {}        3   Angle addition postulate

4. ∠BTP = ∠ATP + ∠B {}             4.  Substitution property of equality

5. ∠PAT = ∠BTP {}                      5.  Substitution property

6. ΔPAT ~ ΔPTB {}                      6. AA similarity postulate

The Angle-Angle, AA, similarity postulate states that two triangles are similar if two angles in one triangle are each equal to two angles in the other triangle.

15. A two column proof is presented as follows;

Statement                        {}                         Reasons

\displaystyle 1. \hspace{0.3 cm} \frac{GJ}{HK}  = \frac{GK}{GM}                            {}          1.  Given

2. ∠1 ≅ ∠G                          {}                   2. Given

3. ΔKHG is an isosceles triangle{}         3. Definition

4. HK = HG {}                                            4. Legs of an isosceles triangle

\displaystyle 5. \hspace{0.3 cm} \frac{GJ}{HG} = \frac{GK}{GM}              {}                         5. Substitution property

6. \overleftrightarrow {HM} ║ \overleftrightarrow{JK}                      {}                    6. BPT, Basic Proportionality Theorem

Basic Proportionality Theorem, BPT, states that if a line parallel to one of the sides of a triangle, intersects the other two sides, then the line divides the other two sides in the same proportion.

Learn more about basic proportionality theorem, AA similarity postulate here:

brainly.com/question/14417137

brainly.com/question/17003791

4 0
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