1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
den301095 [7]
2 years ago
14

The gradient of the tangent of the curve y=2x^3 + ax^2 - x + 3 at the point x=1 is 3. Find the value of a.​

Mathematics
2 answers:
ArbitrLikvidat [17]2 years ago
5 0

Hello!

\large\boxed{a = -1}

y = 2x³ + ax² - x + 3

Find the derivative using the power rule:

y' = 6x² + 2ax - 1

Substitute in the given slope and x value to solve for a:

3 = 6(1)² + 2(1)a - 1

3 = 6 + 2a - 1

4 = 6 + 2a

-2 = 2a

a = -1

Vsevolod [243]2 years ago
3 0

Answer:

a = -1

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

Equality Properties

<u>Calculus</u>

The definition of a derivative is the slope of the tangent line.

The derivative of a constant is equal to 0.

Basic Power Rule:

  • f(x) = cxⁿ
  • f’(x) = c·nxⁿ⁻¹

Step-by-step explanation:

<u>Step 1: Define</u>

y = 2x³ + ax² - x + 3

y'(1) = 3

<u>Step 2: Differentiate</u>

  1. Basic Power Rule:                    y' = 3 · 2x³⁻¹ + 2 · ax²⁻¹ - 1 · x¹⁻¹ + 0
  2. Simplify:                                    y' = 6x² + 2ax - 1

<u>Step 3: Solve for </u><em><u>a</u></em>

  1. Substitute:                         3 = 6(1)² + 2a(1) - 1
  2. Exponents:                        3 = 6(1) + 2a(1) - 1
  3. Multiply:                             3 = 6 + 2a - 1
  4. Combine like terms:         3 = 5 + 2a
  5. Isolate <em>a</em> term:                   -2 = 2a
  6. Isolate <em>a</em>:                            -1 = a
  7. Rewrite:                             a = -1
You might be interested in
Simplify the expression: 1/2 (6y – 8) – (12y – 16) + 7
Dennis_Churaev [7]

Answer:

-9y+19

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
YALL HURRYY I NED HELP!
elena-s [515]

Answer:

A = correct equation

x = 60

Step-by-step explanation:

__+ 65 = 125

x + 65 = 125

x = 60

60 + 65 = 125

Hope it helps!

3 0
3 years ago
Evaluate the integral of the quotient of the cosine of x and the square root of the quantity 1 plus sine x, dx.
VMariaS [17]

Answer:

∫((cos(x)*dx)/(√(1+sin(x)))) = 2√(1 + sin(x)) + c.

Step-by-step explanation:

In order to solve this question, it is important to notice that the derivative of the expression (1 + sin(x)) is present in the numerator, which is cos(x). This means that the question can be solved using the u-substitution method.

Let u = 1 + sin(x).

This means du/dx = cos(x). This implies dx = du/cos(x).

Substitute u = 1 + sin(x) and dx = du/cos(x) in the integral.

∫((cos(x)*dx)/(√(1+sin(x)))) = ∫((cos(x)*du)/(cos(x)*√(u))) = ∫((du)/(√(u)))

= ∫(u^(-1/2) * du). Integrating:

(u^(-1/2+1))/(-1/2+1) + c = (u^(1/2))/(1/2) + c = 2u^(1/2) + c = 2√u + c.

Put u = 1 + sin(x). Therefore, 2√(1 + sin(x)) + c. Therefore:

∫((cos(x)*dx)/(√(1+sin(x)))) = 2√(1 + sin(x)) + c!!!

4 0
3 years ago
Read 2 more answers
The difference of two supplemtary angles is 58 degrees. Find the measures of the angles
erik [133]

Answer:

The measure of the angles are 61° and 119°

Step-by-step explanation:

Let the first angle = x°

let the second angle = y°

The sum of two supplementary angles = 180°

x° + y° = 180° ----- equation (1)

based on the given question; "the difference of two supplementary angles is 58 degrees."

x° - y° = 58° ------- equation (2)

from equation (2), x° = 58° + y°

Substitute the value of x into equation (1)

(58° + y°) + y° = 180°

58 + 2y = 180

2y = 180 -58

2y = 122

y = 122 / 2

y = 61°

The second angle is given by;

x° = 58° + y°

x = 58° + 61°

x = 119°

Thus, the measure of the angles are 61° and 119°

4 0
3 years ago
Simplify 2a - 2/3b - 4 1/2a - 1/6b
ale4655 [162]
Answer can be wrote in two ways. -2.5a-5/6b or -5a/2-5b/6
4 0
3 years ago
Other questions:
  • In a sale, there is 50% off all prices. A chair costs £17.50 in the sale. How much was it before the sale?
    8·2 answers
  • If you get paid $15 and hour, how much would time and a half be?
    15·2 answers
  • A prediction for the volume at 105 seconds is 497 cm3.
    8·2 answers
  • Mr. Thompson took his 5 children
    11·2 answers
  • An absolute value inequality is a compound inequality. True or False
    8·2 answers
  • Por favor me ajudem
    7·1 answer
  • A quadratic functions has zeros of 5 and -2. What could be the equation in factored form?
    12·1 answer
  • A square has a perimeter of 36 mm what is the area of the square
    13·1 answer
  • A: HL<br> B: ASA<br> C: SSS<br> D: SAS
    9·1 answer
  • 1 pts
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!