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3 years ago

Which one should I choose

Mathematics

2 answers:

gogolik [260]3 years ago

7 0

Answer:

the last option, 9

Step-by-step explanation:

if x=2 then you would just plug x into the equation to get:

y=3^2 or 3 squared and that's just:

3x3 which is

So your answer would be 9

I hope this helps! blessings, have a lovely day/night, xo, nm :) <3

erik [133]3 years ago

3 0

Answer: 9

Step-by-step explanation:

Since x=2 that means there should be 2 3s being multiplied since it’s 3 to the second power. So 3x3 which equals 9. If this answer helped please mark it brainliest!

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4. Solve the quadratic by completing the square.<br> 4x² + 16x +49 = 8

Setler79 [48]

values of x are $x=\frac{5i}{2}-2\,\,and\,\,x=\frac{-5i}{2}-2$

Step-by-step explanation:

We need to solve the equation $4x^2+16x +49 = 8$ by completing square.

Solving:

$4x^2+16x +49 = 8\\4x² + 16x +49-8 = 0\\4x² + 16x +41 = 0\\$

We need to make the completing square form: $(a)^2+2(a)(b)+(b)^2=(a+b)^2$

$4x^2 + 16x +41 = 0\\Adding\,\,and\,\,subtracting\,\, 16 \\(2x)^2+2(2x)(4)+(4)^2+41-16=0\\(2x+4)^2+25=0\\(2x+4)^2=-25$

Finding value of x:

$(2x+4)^2=-25\\Taking\,\,square\,\,root\,\,on\,\,both\,\,sides:\\\sqrt{(2x+4)^2}=\sqrt{-25}\\ 2x+4=\pm5i\\so, 2x+4=5i\,\,and\,\,2x+4=-5i\\2x=5i-4\,\,and\,\,2x=-5i-4\\x=\frac{5i-4}{2} \,\,and\,\,x=\frac{-5i-4}{2} \\x=\frac{5i}{2}-2\,\,and\,\,x=\frac{-5i}{2}-2$

So, values of x are $x=\frac{5i}{2}-2\,\,and\,\,x=\frac{-5i}{2}-2$

Keywords: Solve Quadratic Equation

Learn more about Solving Quadratic Equations at:

#learnwithBrainly

6 0

4 years ago

2.5 pounds of grapes cost 2.25 dollars what is the cost per pound

Solnce55 [7]

I think it’s 0.9 dollars

7 0

3 years ago

The function g is defined by g(x)=2x² +5.<br> Find g(3x).<br> g(3x)=

victus00 [196]

Answer:

All you have to do is substitute the value of x= -3 into the equation, then

g(-3) = -2(-3)2 + 3(-3) = -2(9) -9 = -18 - 9 = -27

Step-by-step explanation:

5 0

3 years ago

Substitution for y=3x-34 and y=2x-5

Lelu [443]

Y=3x-34
y=2x-5
both are equal to y

3x-34=y=2x-5
3x-34=2x-5
minus 2x both sides
x-34=-5
add 34both sides
x=29

sub back

y=2x-5
y=2(29)-5
y=58-5
y=53

x=29
y=53
(29,53)

8 0

3 years ago

Allen's unpaid credit card balance was $3,426.67 his APR is 16.8% what is his new balance after he makes one new transaction for

gayaneshka [121]

Your answer would be $3,395.00. Hope this helps! :)

5 0

3 years ago

Read 2 more answers