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vagabundo [1.1K]
3 years ago
11

21z^2+85z-26=0 Please solve using factoring

Mathematics
1 answer:
const2013 [10]3 years ago
7 0
Trial and error
either
(z )(21z )
(3z )(7z  )
and ending with
( -1)( 26)
( -26)( 1)
( -2)( 13)
( 2)( -13)
trial enderor


after some times
(3x+13)(7x-2)=0

set to zero
3x+13=0
3x=-13
x=-13/3

7x-2=0
7x=2
x=2/7

x=-13/3 or 2/7
it would be easier to use quadratic formula though
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Jacob sells his motorbike for £112 making a loss of 12% on its original price. Work out its original price
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Answer:

125,44

Step-by-step explanation:

Loss = 112÷100*12

=13,44

Therefore : 112 + 13%

=112 + 13,44

=125,44

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2 years ago
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kati45 [8]
a.
h = 2c - 3

b.
3h + 1.5c = 201

c.
We have a system of equations from part a and b.
h = 2c - 3   (equation 1)
3h + 1.5c = 201   (equation 2)

We use substitution method to solve this system.
Substitute equation 1 in equation 2 to get
3h + 1.5c = 201
>> 3(2c - 3) + 1.5c = 201
>> 6c - 9 + 1.5c = 201
>> 7.5c = 201 + 9
>> 7.5c = 210
>> c = 210 / 7.5
>> c = 28

Plug this value back in equation 1 to get
h = 2c - 3  
>> h = 2(28) - 3 = 56 - 3 = 53

So, c = 28 and h = 53 implies that <u>28 corndogs</u> and 53 hotdogs were sold.
3 0
3 years ago
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ikadub [295]
Here is the answer , and the explanation is written with it .

6 0
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