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3 years ago

Only number 7 Please

Mathematics

1 answer:

Reptile [31]3 years ago

8 0

Answer:

Step-by-step explanation:

20 problems

correct=+4

false=-1

unanswered=0

Uncorrectly:5 => -5

unanswered:2 =>0 points

20x4=80 points in total(only correct awnsers)

=>20-5+2=13 correct awnsers

13x4=52

52-5=47

It will be nice if you give me brainliest. Good luck!

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Tìm x : 2x^2-7x+3=0<br> giúp tui zới, please

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<h2>Solving Quadratic Equations with the Quadratic Formula</h2>

<h3>Answer:</h3>

$x = 3$ and $x = \frac{1}{2}\\$

<h3>Step-by-step Explanation: </h3>

Recall:

if we have a quadratic equation, $ax^2 +bx +c = 0$ , where $a$ , $b$ and $c$ are real numbers and $a \neq 0$ , $x = \frac{-b \pm \sqrt{b^2 -4ac}}{2a}$ .

Given:

$2x^2 -7x +3 = 0$

Solving for $x$ :

$x = \frac{-(-7) \pm \sqrt{(-7)^2 -4(2)(3)}}{2(2)} \\ x = \frac{-(-7) \pm \sqrt{49 -4(2)(3)}}{2(2)} \\ x = \frac{7 \pm \sqrt{49 -24}}{4} \\ x = \frac{7 \pm \sqrt{25}}{4} \\ x = \frac{7 \pm 5}{4}$