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Romashka-Z-Leto [24]
3 years ago
12

4w^2-21w+20 factor the quadratic expression

Mathematics
2 answers:
AfilCa [17]3 years ago
7 0

Answer:

(4w-5)(w-4)

Step-by-step explanation:

4w^{2}-21w+20\\ 4w^{2}-5w-16w+20\\ w(4w-5)-16w+20\\w(4w-5)-4(4w-5)\\(4w-5)(w-4)

Fittoniya [83]3 years ago
6 0

Answer:

(4w - 5) (w - 4)

Step-by-step explanation:

4w² - 21w + 20

We will look two numbers that when we add will give is -21 and when we multiply will give us 20 × 4= 80 and these numbers are -16 and -5.

4w² - 16w - 5w + 20

4w(w - 4) - 5(w - 4)

(4w - 5) (w - 4)

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Solving two-step and multiply equation
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3 years ago
How can I use the percent equation???Ex.what number is 40% of 500???and can u solve this one,too.:45 is 25% of what number???THA
HACTEHA [7]
I've been waiting for someone to ask this question.  It's one of my favorite questions to answer.

percent means out of 100 so 1% = 1/100 and 40%=40/100 or 1/25
so for percent of a number, 'of' means multiply so 40% of 500= 40/100 times 500 or 20000/100 or 200



if you multiply a fraction by its recipricol (the number fliped upside down) the you will get 1 so if you multiply 1/2 by 2/1 then you will get 1

thus
percent is out of 100 so 1%=1/100  25%=25/100
if you represent 45 out of something as 45/x then you multiply it by the reciprocal of the fraction that is supposed to be equal (1/2 =2/4) then you will get 1
so 45/x times reciprocal of 100/25 then you will get 1/1 or 4500/25x
so you divide to find x and get 180
so 45 is 25% of 180


The following is extra
   as stated above 'of' can be taken as multiply so
   45 is 25% of 180 can be rewriten as
   45=25/100 times 180
   but we don't know that 180 is the answer so we replace it with x then            solve for x
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3 years ago
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Jin bought a book that cost $5.60if the tax rate is 70% how much tax did he pay?
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Answer:

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Step-by-step explanation:

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Answer:

...

Step-by-step explanation:

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