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Fofino [41]
4 years ago
7

Solve the equation 2x^2-7x=9

Mathematics
2 answers:
dalvyx [7]4 years ago
6 0
X=−1, 9/2 Decimal Form: -1, 4.5
pantera1 [17]4 years ago
5 0
Minus 9 from both sides
2x^2-7x-9=0
factor
(2x-9)(x+1)=0

set each to zero
2x-9=0
2x=9
x=9/2

x+1=0
x=-1

x=9/2 and -1
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Fine length of BC on the following photo.
MrMuchimi

Answer:

BC=4\sqrt{5}\ units

Step-by-step explanation:

see the attached figure with letters to better understand the problem

step 1

In the right triangle ACD

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step 2

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step 3

In the right triangle ABC

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cos(\angle BAC)=\frac{AC}{AB}

substitute the given values

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step 4

Find the value of x

In this problem

\angle CAD=\angle BAC ----> is the same angle

so

equate equation A and equation B

\frac{8\sqrt{5}}{16+x}=\frac{2}{\sqrt{5}}

solve for x

Multiply in cross

(8\sqrt{5})(\sqrt{5})=(16+x)(2)\\\\40=32+2x\\\\2x=40-32\\\\2x=8\\\\x=4\ units

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step 5

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BC^2=DC^2+DB^2

substitute the given values

BC^2=8^2+4^2

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7 0
3 years ago
3. (07.04)
Naddik [55]

Answer:

The probability  that an applicant does not get a job if he or she has an interview is 20%.

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Bas_tet [7]
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