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3 years ago

Evaluate the polynomial 6x - y, for x = - 3 and y = 2.

Mathematics

2 answers:

Ivahew [28]3 years ago

5 0

Answer:

Do the order of operations after you plug everything in. If that doesn't help do a proof.

6x-y turns into 6(-3)-2. Do parenthesis () first, (-18)-2. You will get the finally answer of -20.

professor190 [17]3 years ago

3 0

Answer:

Step-by-step explanation:

6x - y

Put the values of x = -3 and y = 2 to the expression:

6(-3) - 2 = -18 - 2 = -20

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When the sum of 5 and three times a positive number is subtracted from the square of the number, 0 results. Find the number.

Juliette [100K]

$x-the\ number\\\\x^2-(5+3x)=0\\\\x^2-5-3x=0\\\\x^2-3x-5=0$

$Use\ the\ quadratic\ formula:\\a^2x+bx+c=0\\\\\Delta=b^2-4ac\\\\if\ \Delta > 0\ then\ x_1=\dfrac{-b-\sqrt\Delta}{2a}\ and\ x_2=\dfrac{-b+\sqrt\Delta}{2a}\\\\if\ \Delta=0\ then\ x_0=\dfrac{-b}{2a}\\\\if\ \Delta < 0\ then\ no\ solution$

$x^2-3x-5=0\\\\a=1;\ b=-3;\ c=-5\\\\\Delta=(-3)^2-4\cdot1\cdot(-5)+3+20=29 \ \textgreater \ 0\\\\\sqrt\Delta=\sqrt{29}\\\\x_1=\dfrac{3-\sqrt{29}}{2\cdot1}=\dfrac{3-\sqrt{29}}{2} \ \textless \ 0\\\\x_2=\dfrac{3+\sqrt{29}}{2\cdot1}=\dfrac{3+\sqrt{29}}{2} \ \textgreater \ 0$

$Answer:\ \boxed{x=\dfrac{3+\sqrt{29}}{2}}$

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3 years ago

ASAP WILL GIVE BRAINLIEST

wlad13 [49]

Answer:

802.75 pi

Step-by-step explanation:

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3 years ago

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What is the volume of the cylinder below?

3241004551 [841]

Answer:

Step-by-step explanation:

It is C.

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3 years ago

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A 6?-ft vertical post casts a 10?-in shadow at the same time a nearby cell phone tower casts a 120?-ft shadow. How tall is the c

Advocard [28]

Answer:

72?-ft

Step-by-step explanation:

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3 years ago

-6(y+15)=-3y+6<br> what value of y makes the equation true

AlladinOne [14]

Answer:

y = -32

Step-by-step explanation:

-6(y+15)=-3y+6

Distribute

-6y - 90 = -3y +6

Add 6y to each side

-6y -90+6y = -3y+6y +6

-90 = 3y+6

Subtract 6 from each side

-90 -6 = 3y +6-6

-96 = 3y

Divide by 3

-96/3 = 3y/3

-32 = y

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3 years ago

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