(4-5i)(-2+7i) what is the answer

Mathematics

2 answers:

Strike441 [17]4 years ago

8 0

Answer:

27 + 38 i

Explanation:

(4 - (5 * i)) * ((-2) + (7 * i)) =

Virty [35]4 years ago

6 0

Answer:

$- 35 {i}^{2} + 10i + 20$

Step-by-step explanation:

-8 + 28 + 10i - 35i^2

-35i^2 + 10i + 20

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Hi guys i cant get this question can yous please help me its due in two days

Natasha2012 [34]

Answer:

(2400+420).

Step-by-step explanation:

We can break this into the same pattern as the other numbers, giving us:

(60×40)+(60×7)

When we multiply these we get:

(2400+420).

7 0

4 years ago

Finding the interpolating polynomial for the function

zhenek [66]

Answer:

f(x) = x^3 -2x^2 -3x +7

Step-by-step explanation:

Cubic polynomial regression using your favorite tool (graphing calculator, spreadsheet, or web site) will tell you the interpolating polynomial is ...

f(x) = x^3 -2x^2 -3x +7

_____

You can use Lagrange polynomial interpolation. It gives the function as the sum of four factored cubics:

$f(x)=3\cdot\dfrac{(x-2)(x-3)(x-4)}{(1-2)(1-3)(1-4)}+1\cdot\dfrac{(x-1)(x-3)(x-4)}{(2-1)(2-3)(2-4)}+\\\\\text{ }\qquad7\cdot\dfrac{(x-1)(x-2)(x-4)}{(3-1)(3-2)(3-4)}+27\cdot\dfrac{(x-1)(x-2)(x-3)}{(4-1)(4-2)(4-3)}$