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3 years ago

13

Which one is right ?

1 answer:

sergey [27]3 years ago

7 0

Answer:

6/10

Step-by-step explanation:

all can be reduced to 2/5, except 6/10:

2/5

8/20=2/5 (divide out 4)

12/30=2/5 (divide out 6)

but not

6/10 = 3/5!

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$2x^2-12x+5$

Step-by-step explanation:

$(2x^2-3x+5)(x^2+4x+1)\\(2x^2-12x+5)$

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3 years ago

Mary's weight went from 80kg to 68kg. express her weight loss as a % of her original weight

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80-68=12

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12% is the answer

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3 years ago

<img src="https://tex.z-dn.net/?f=%5Cleft%20%5C%7B%20%7B%7Ba%5E2%20-2a-b%5E2%3D0%7D%20%5Catop%20%7B2b%2B2ab%3D0%7D%7D%20%5Cright

oksian1 [2.3K]

Given :-

a² - 2a - b² = 0
2b + 2ab = 0

To find :-

Value of a and b .

Solution :-

<u>Taking</u><u> </u><u>second</u><u> </u><u>equation</u><u>:</u><u>-</u>

2b + 2ab = 0
2b ( 1 + a ) = 0
2b = 0 or (1+a) = 0
b = 0 , a = -1

<u>Substitute</u><u> </u><u>in </u><u>first </u><u>equation</u><u> </u><u>:</u><u>-</u><u> </u>

a² - 2a - b² = 0

<u>When </u><u>b </u><u>=</u><u> </u><u>0</u><u> </u><u>,</u>

a² - 2a - 0² = 0
a² - a = 0
a( a -1) =0
a = 0 , 1

<u>When </u><u>a </u><u>=</u><u> </u><u>-</u><u>1</u><u> </u><u>,</u>

(-1)² - 2*(-1) - b² = 0
1 + 2 - b² = 0
b² = 3
b = ±√3

<u>Answer </u><u>:</u><u>-</u><u> </u>

a = 0,1 ; b = 0
a = -1 , b = ±√3

8 0

2 years ago