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2 years ago

!!PLEASE HELP MY PARENTS ARE MAD AT ME FOR MY GRADES!! f( x) = -3 x – 5, calculate f(-7)

Mathematics

2 answers:

Alexus [3.1K]2 years ago

6 0

Answer:

Step-by-step explanation:

I did it on math.way and its right

I hope this helps

Stolb23 [73]2 years ago

4 0

Answer:

Step-by-step explanation:

plugin -7 for where x is

f(-7)= (-3)(-7)-5

=21-5 is 16

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Answer please i need this

MakcuM [25]

Answer:

it looks like 7

Step-by-step explanation:

3 0

2 years ago

7. Use the quadratic formula to find the solution(s). x² + 2x - 8 = 0

morpeh [17]

Hey there!

Use the quadratic formula to find the solution(s). x² + 2x - 8 = 0

Answer :

x = -4 or x = 2 ✅

Explanation :

Quadratic formula : ax² + bx + c = 0 where a ≠ 0

The number of real-number solutions (roots) is determined by the discriminant (b² - 4ac) :

If b² - 4ac > 0 , There are 2 real-number solutions

If b² - 4ac = 0 , There is 1 real-number solution.

If b² - 4ac < 0 , There is no real-number solution.

The roots of the equation are determined by the following calculation:

$x = \frac{ - b \pm \sqrt{ {b}^{2} - 4ac } }{2a}$

Here, we have :

a = 1
b = 2
c = -8

1) Calculate the discriminant :

b² - 4ac ⇔ 2² - 4(1)(-8) ⇔ 4 - (-32) ⇔ 36

b² - 4ac = 36 > 0 ; The equation admits two real-number solutions

2) Calculate the roots of the equation:

▪️ (1)

$x_1 = \frac{ - b - \sqrt{ {b}^{2} - 4ac} }{2a} \\ \\ x_1 = \frac{ - 2 - \sqrt{36} }{2(1) } \\ \\ x_1 = \frac{ - 2 - 6}{2} \\ \\ x_1 = \frac{ - 8}{2} \\ \\ \blue{\boxed{\red{x_1 = -4}}}$

▪️ (2)

$x_2 = \frac{ - b + \sqrt{ {b}^{2} - 4ac } }{2a} \\ \\ x_2 = \frac{ - 2 + \sqrt{36} }{2(1)} \\ \\ x_2 = \frac{ - 2 + 6}{2} \\ \\ x_2 = \frac{4}{2} \\ \\ \red{\boxed{\blue{x_2 = 2}}}$

>> Therefore, your answers are x = -4 or x = 2.

Learn more about quadratic equations:

brainly.com/question/27638369

6 0

2 years ago

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Round each number to the nearest whole number. What is the best estimate for the answer to 276.37 – 67.81? A. 209 B. 208.6

pav-90 [236]

A.209

276.37 – 67.81 = 208.56
The 5 in .56 means round up.
This means 208.56 will turn into 209.

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3 years ago

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How does the function g(x)= - (x - 1) compare to the parent function f(x) = x ?

grandymaker [24]

Reflection across x axis and move 1 unit to the right

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3 years ago

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snow_tiger [21]

The scale factor is what u multiply the first image by to get the second image. So by dividing the second image by the first image will give u the scale factor.

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3 years ago

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