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pav-90 [236]
3 years ago
15

2x² + 9 = - 7x how do i find an answer using the quadratic formula

Mathematics
1 answer:
jok3333 [9.3K]3 years ago
7 0

Answer:

(-7 ± i√(-23)) / 4

Step-by-step explanation:

Unless you have to show your work, you don't really have to use the quadratic formula unless it is unfactorable.

2x² + 9 = -7x    (Add 7x to both sides)

2x² + 7x + 9 = 0    ( The quadratic formula is (-b ± √(b^2 - 4ac))/2a )

A = 2

B = 7

C = 9

(-7 ± √(49 - 72))/4

= (-7 ± √(-23))/4    (Which simplifies to an imaginary answer, proving that this is, indeed, unfactorable)

= (-7 ± i√(-23))/4

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Which of the following is the reciprocal of 1 2/3
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Evaluate the algebraic expression.<br> z^2+1+y when y=4, and z=3.
Luden [163]

Answer:

your question is

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is your answer

5 0
1 year ago
Help me plz it’s confusing
Alja [10]
X+8>= 18
therefore, the circle has to be on ten, (solid) and an arrow pointing to the right, 
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-7+x>= -8
the circle is going to be on -1, (solid) and pointing to the right.  
-7 +-1 (-8) >=-8 which is true, then -7 +0>= -8 which is true
n-2<=4 so, the answer is a dot (solid) on 6 pointing to the left 
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-18+n<-7
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n-4>=13
so, this has to be greater than or equal to 13.
n must be greater than or equal to 17 (add 4 to both sides) so the dot (solid) is going to be on 17 and pointing to the right.

NOTICE: I had a different explanation for number 9, which is how I figured each one out.
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5 0
3 years ago
A b c or d. use pic to solve
Neporo4naja [7]

Answer:

In Heather's solution to the problem, she wrote and solved an equation.

Her work is:

Step 1: 1.08(x +9.01 +0.98 +5.01) = 21.87

Solving like terms

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dividing both side by 1.08

we get

x+15=21.87/1.08

x+15=20.25

subtracting both side by 13.9198

x=20.25-15

x=5.25

According to correction

;

<u>Option 1st</u>

<u>yes,it is correct</u>

5 0
2 years ago
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