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2 years ago

Solve by factoring: a² = 25

Mathematics

2 answers:

Alex73 [517]2 years ago

4 0

A=+ or - 5 bc -5x-5 or 5x5 equals to 25

Sophie [7]2 years ago

4 0

Answer:

$a=$ ± $5$

Step-by-step explanation:

$a^{2} =25$

equal to zero

$a^{2} -25=0$

factor: difference of squares

$(a+5)(a-5)=0$

first factor:

$a+5=0\\a_{1} =-5$

second factor:

$a-5=0\\a_{2} =5$

Hope this helps

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It would take Delia 3 hours longer to re tile their bathroom by herself than it would for kari to retile on her own. If they wor

max2010maxim [7]

Answer:

6hours

Step-by-step explanation:

From the given information:

Suppose it took Karl x hours to retile her bathroom,

Then it will take Della 3 hours longer i.e (3+x) hours

If Della and Karl work together or will take them 2 hours

The objective is to determine how long it will take Delia to retile the bathroom alone?

∴

$\dfrac{1}{x}+\dfrac{1}{3+x}= \dfrac{1}{2}$

$\dfrac{x+3+x}{x(3+x)}= \dfrac{1}{2}$

$\dfrac{2x+3}{3x+x^2}= \dfrac{1}{2}$

By cross multiplying, we have:

2(2x+3) = 3x+x²

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3x + x² - 4x - 6

x² - x - 6 = 0

Using quadratic equation

x² -3x +2x - 6 = 0

x(x - 3) + 2(x - 3) = 0

(x +2) (x - 3) = 0

x + 2 = 0 or x - 3 = 0

x = -2 or x = 3

Since we are concerned about the positive integer,

Then, Karl = x = 3 hours while Della which is (3+x) = 3+3 = 6hours

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3 years ago

Mark had 4 members in his family each of the person get 1/6 what Is the fraction of the tomato use fraction strips

umka21 [38]

If each person got 1/6 then there is still 2/6 left over, =1/3. In fraction strips, we would do

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Hope this helps, if you need any more help just comment :)

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3 years ago

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MakcuM [25]

Answer:

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Step-by-step explanation:

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I hope this helps! :)

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3 years ago

Factor: x2 - 11x + 30

Nonamiya [84]

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3 years ago

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