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2 years ago

Please help and explain so I understand!!

Mathematics

1 answer:

olga_2 [115]2 years ago

8 0

Answer:

x=5

Step-by-step explanation:

$4x^2-11=89$

add 11 to both sides

$4x^2=100$

Divide 4 on both sides

$x^2=25$

Take the square root of both sides to eliminate the power of two from x

$\sqrt{x^2} =\sqrt{25}$

Simplify

$x=5$

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25x2 + 16 – 40x – 64y

Sedaia [141]

Answer:

25x2 - 40x - 64y + 16

Step-by-step explanation:

Step 1 :

Equation at the end of step 1 :

((52x2 + 16) - 40x) - 64y

Step 2 :

Final result :

25x2 - 40x - 64y + 16

Processing ends successfully

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3 years ago

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If a hand sanitizer cleans 99.9% of bacteria if u use it 2 times does that make it 100%

Viktor [21]

Answer:

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Step-by-step explanation:

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2 years ago

Simplify the following algebraic expression 2(x^2+3x)-10(x^2+2)

4vir4ik [10]

Answer:

-8x^2+6x-20

Step-by-step explanation:

2(x^2+3x)-10(x^2+2)

2x^2+6x-10x^2-20

(2x^2-10x^2)+6x-20

-8x^2+6x-20

6 0

3 years ago

P= A. i B. -1 C. -i D. 1

Molodets [167]

Answer:

la respuesta es capó la B

Step-by-step explanation:

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3 years ago

Solve x2 + 2x = 4 for x by completing the square. x equals plus or minus square root of 5 plus 1 x equals plus or minus square r

steposvetlana [31]

Answer:

x equals plus or minus square root of 5 minus 1

Step-by-step explanation:

we have

$x^{2} +2x=4$

Divide by 2 the coefficient of the x-term

$2/2=1$

squared the number

$1^2=1$

Adds both sides

$x^{2} +2x+1=4+1$

$x^{2} +2x+1=5$

Rewrite as perfect squares

$(x+1)^{2}=5$

take the square root both sides

$x+1=(+/-)\sqrt{5}$

$x=(+/-)\sqrt{5}-1$

therefore

x equals plus or minus square root of 5 minus 1

4 0

3 years ago

Please help and explain so I understand!!​

Please help and explain so I understand!!