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Feliz [49]
3 years ago
5

How can you rewrite the expression (8-5i)^2 in the form of a +bi

Mathematics
1 answer:
olchik [2.2K]3 years ago
3 0
\bf \textit{recall that }i^2=-1\\\\
-------------------------------\\\\
(8-5i)^2\implies (8-5i)(8-5i)\implies 64-40i-40i+(5i)^2
\\\\\\
64-80i+(5^2i^2)\implies 64-80i+(25\cdot -1)\implies 64-80i+(-25)
\\\\\\
64-80i-25\implies 39-80i
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Are these correct? If not help me please??
Verizon [17]

Answer: no, no, yes, no, yes, yes

Step-by-step explanation:

x + 1, 2x, these are not equivalent

no

10x, 5(x+5)

5(x+5) distribute the 5 to get 5(x+5) = 5x + 25

5x + 25 is not equal to 10x, so no

no

1 + 2x = 2x + 1, these are equivalent since the constant and coefficients are the same

yes

2x, 2x - 5, these are not equivalent since once has a constant of -5 while the other does not

no

15x -1, 3(x+4x) - (3-2)

3(x+4x) - (3-2) combine like terms

3(5x) - (1) multiply through parentheses

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yes

1/2 * (4x-2),2x-1

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so these two are equivalent

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3 0
3 years ago
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Plz help me I will give you a brainest​
Lady bird [3.3K]

Answer: −2.4f − 22

Step-by-step explanation: simply combine like terms. -2.7f + .3f would be -2.4f, and -14 - 8 is -22.

4 0
2 years ago
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Which of the following is not a solution of 10 > x – 7y?
ASHA 777 [7]
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7 0
3 years ago
X^2+15x+c is a perfect square trinomial, what is c?
Natalija [7]

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3 years ago
2 Points<br> What is the center of the circle given by the equation (x+ 5)^2 + (y-8)^2 = 1?
Y_Kistochka [10]

Answer:

(- 5, 8 )

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

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with centre (h, k ) = (- 5, 8 )

5 0
3 years ago
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