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Olin [163]
3 years ago
9

(a) Use the fundamental theorem of algebra to determine the number of roots for 2x^2+4x+7 show your work

Mathematics
1 answer:
postnew [5]3 years ago
4 0

Answer:

The answer to your question is: This polynomial does not have root, it does not intercept the x-axis.

Step-by-step explanation:

a)

                                             2x² + 4x + 7

To determine the number of roots of this polinomial, just look at the higher power and that number will be the maximum possible number of roots.

In this exercise, the maximum power is 2, so this polynomial could have at most 2 roots.

b) Find the possible roots of the polynomial, which are multiples of 7

   Possible roots:  ±1, ±7

                                             2x² + 4x + 7

Use synthetic division to find the roots

                                   2     4     7       1

                                          2     6                              

                                   2     6    13                   +1 is not a root

                   

                                   2    4     7        -1

                                        -2    -2                  

                                   2    2    5                    -1 is not a root

                                  2     4     7         7

                                         14   126                  

                                  2     18  133                  +7 is not a root

                                  2     4     7        -7

                                        -14   70                  

                                  2    -10   -77              -7 is not a root

                   

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To solve, isolate the x. Cross multiply

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Isolate the x. Divide by 13.

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Answer:

Δ JKL is similar to Δ ABC ⇒ D

Step-by-step explanation:

Similar triangles have equal angles in measures

In ΔABC

∵ m∠A = 15°

∵ m∠B = 120

∵ The sum of the measures of the interior angles of a Δ is 180°

∴ m∠A + m∠B + m∠C = 180°

→ Substitute the measures of ∠A and ∠B

∵ 15 + 120 + m∠C = 180

→ Add the like terms in the left side

∴ 135 + m∠C = 180

→ Subtract 135 from both sides

∴ 135 - 135 + m∠C = 180 - 135

∴ m∠C = 45°

The similar Δ to ΔABC must have the same measures of angles

If triangles ABC and JKL are similar, then

m∠A must equal m∠J

m∠B must equal m∠K

m∠C must equal m∠L

∵ m∠J = 15°

∴ m∠A = m∠J

∵ m∠L = 45°

∴ m∠C = m∠L

∵ m∠J + m∠K + m∠L = 180°

→ Substitute the measures of ∠J and ∠L

∵ 15 + m∠K + 45 = 180

→ Add the like terms in the left side

∴ 60 + m∠K = 180

→ Subtract 60 from both sides

∴ 60 - 60 + m∠K = 180 - 60

∴ m∠K = 120°

∴ m∠B = m∠K

∴ Δ JKL is similar to Δ ABC

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