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2 years ago

Someone help me with quadratics? will give points

Mathematics

1 answer:

goldenfox [79]2 years ago

8 0

The answer is Option 1: $\frac{1\±i\sqrt{31}}{2}$

Step-by-step explanation:

Given equation is;

x²-x+8=0

Here,

a=1 , b= -1 , c=8

Quadratic formula is;

$x=\frac{-b\±\sqrt{b^2-4ac}}{2a}$

Putting values in equation;

$x=\frac{-(-1)\±\sqrt{(-1)^2-4(1)(8)}}{2(1)}\\\\x=\frac{1\±\sqrt{1-32}}{2}\\\\x=\frac{1\±\sqrt-31}{2}\\\\x=\frac{1\±i\sqrt{31}}{2}$

The answer is Option 1: $\frac{1\±i\sqrt{31}}{2}$

Keywords: quadratic formula, equation

Learn more about quadratic formula at:

#LearnwithBrainly

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Nataly [62]

Answer:

see explanation

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sum the 3 angles and equate to 180

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x = 9

Then

∠ ACB = 4x + 2 = 4(9) + 2 = 36 + 2 = 38°

∠ BAC = 5x + 7 = 5(9) + 7 = 45 + 7 = 52°

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Since the triangles are congruent then corresponding angles are congruent , so

∠ B = ∠ E

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2 years ago

The angle marked a = 79°. Work out the value of x. The diagram is not drawn accurately.

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Answer:

x = 101 degrees

Step-by-step explanation

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2 years ago

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Which comparison statement is true? A. 7.24 < 7.240 B. 7.24 > 7.240 C. 7.24 = 7.240

KIM [24]

The answer is c they are equal to each other because the zero does not add anything to that number it is a place holder.

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2 years ago

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En said the value of the expression 72-8^2 +6*3 is 50. What mistake did Ben make? Correct Ben’s mistake and give the value of th

posledela

Given:

$72-\frac{8}{2}+6\times3$

He does mistake in the order of giving preference.

We should give preference in the order, division, multiplication, addition, subtraction.

But, he gave the first preferrence to the subtraction.

72-8=64

Next, he used division

64/2=32

Next he adds 32 with 8.

So, he gets 50.

But the actual simplification is,

Simplifying we get,

$\begin{gathered} 72-\frac{8}{2}+6\times3=72-4+18 \\ =68+18 \\ =86 \end{gathered}$

Hence, the correct value of the expression is 86.

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7 months ago

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zheka24 [161]

Answer: a. 0.40 b. 0.23 c . 0.435 d . 0.25

Step-by-step explanation:

melanin content Total

high low

moisture high 13 10 23

content low 47 30 77

Total 60 40 100

Let A denote the event that a sample has low melanin content, and let B denote the event that a sample has high moisture content.

a) Total skin samples has low melanin content = 10+30=40

P(A)= $\dfrac{40}{100}=0.40$

b) Total skin samples has high moisture content = 13+10=23

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d) $P (B|A)=\dfrac{P(A\cap B)}{P(A)}$

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2 years ago