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Debora [2.8K]
3 years ago
6

7x(x+1.8)=0 please help !

Mathematics
2 answers:
Sedbober [7]3 years ago
8 0

The value of x are \boxed{x = 0} and \boxed{x = 1.8}.

Further explanation:

Given:

The equation is 7x\left( {x + 1.8} \right).

Explanation:

Degree is defined as the highest power of the polynomial function.

The Fundamental Theorem of Algebra states that the polynomial has n roots if the degree of the polynomial is n.

f\left( x \right) = a{x^n} + b{x^{n - 1}} +  \ldots  + cx + d

The polynomial function has n roots or zeroes.

The given equation is 7x\left( {x + 1.8} \right).

Solve the equation 7x\left( {x + 1.8} \right) to obtain the value of x.

\begin{aligned}7x\left( {x + 1.8} \right)&= 0\\7x &= 0{\text{ or }}x + 1.8 &= 0\\x&= 0{\text{  or  }\;}x &= - 1.8\\\end{aligned}

The value of x are \boxed{x = 0} and \boxed{x = 1.8}.

Learn more:

  1. Learn more about inverse of the functionhttps://brainly.com/question/1632445.
  2. Learn more about equation of circle brainly.com/question/1506955.
  3. Learn more about range and domain of the function brainly.com/question/3412497.

Answer details:

Grade: High School

Subject: Mathematics

Chapter: Polynomial

Keywords: power function, 7x(x+1.8), degree, represented, table, degree of the polynomial, roots, linear equation, quadratic equation, zeros, function, polynomial, solution, cubic function, degree of the function.

lbvjy [14]3 years ago
3 0

7x ( x + 1.8 ) = 0 → x = 0 or x = -1.8

<h3>Further explanation</h3>

Discriminant of quadratic equation ( ax² + bx + c = 0 ) could be calculated by using :

<h2>D = b² - 4 a c</h2>

From the value of Discriminant , we know how many solutions the equation has by condition :

D < 0 → No Real Roots

D = 0 → One Real Root

D > 0 → Two Real Roots

Let us now tackle the problem!

<u>Given :</u>

7x ( x + 1.8 ) = 0

<u>Solution :</u>

(7x )( x + 1.8 ) = 0

(7x) = 0 \texttt{ or } (x + 1.8) = 0

x = 0 \div 7 \texttt{ or } x = 0 - 1.8

x = 0 \texttt{ or } x = - 1.8

<h3>Therefore, the solution is x = { 0 , -1.8 }</h3>

<h3>Learn more</h3>
  • Solving Quadratic Equations by Factoring : brainly.com/question/12182022
  • Determine the Discriminant : brainly.com/question/4600943
  • Formula of Quadratic Equations : brainly.com/question/3776858

<h3>Answer details</h3>

Grade: High School

Subject: Mathematics

Chapter: Quadratic Equations

Keywords: Quadratic , Equation , Discriminant , Real , Number , Solution , Zero , Root

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mote1985 [20]

Answer:

c. f(x)=x(x+2)(x-1)(x-4)

Step-by-step explanation:

Where it says "as x goes to negative infinity" then "y goes to infinity" (that's the part with the infinity symbols) that means the graph is going up at it's left end. This curve is a quartic (4th degree) which means its left and right ends are kind of parabola-ish, but the middle is not the neat u-ish, v-ish shape of a parabola; it's more like a wonky, noodle-ish wavy affair. Anyway, LIKE a parabola when the beginning of the equation is positive, the two ends point up. That's what's happening here and so we can eliminate b. and d. as potential answers.

Since -2, 0, 1, 4 are zeros (which are solutions...and also x-intercepts) we can find the factors of the function.

If x = -2

ADD 2 to both sides.

x + 2 = 0

This means (x+2) is a factor.

This is enough info to select answer c. but let's verify the other factors.

If x = 1

SUBTRACT 1 from both sides.

x - 1 = 0

Thus means (x - 1) is a factor.

If x = 4

SUBTRACT 4 from both sides.

x - 4 = 0

(x - 4) is a factor.

You can see c. has all these factors as well as x, because x=0 already, so x is a factor too.

I think of this as a working backwards problem, bc usually you have to factor and solve. This one, you have solutions (which are zeros and x-intercepts) and work backwards to find factors and multiply them together to find the function.

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X
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Answer: 67.725feet²

Step-by-step explanation:

A heptagon consist of 7 sides and Its area is calculated using the formula

= 1/2 × nsr

n = number of sides = 7

s = side length = 4.3

r = apothem = 4.5

Area = 1/2 × nsr

= 1/2 × 7 × 4.3 × 4.5

= 0.5 × 7 × 4.3 × 4.5

= 67.725feet²

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