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3 years ago

If 3X + 2 equals 11, could X equal 5

Mathematics

2 answers:

netineya [11]3 years ago

8 0

Hey there!

We need to find the one value of x that, when plugged in, will equal 11.

You have asked if x can equal 5. Let's plug it in and see if it works.

3(5)+2=11

15+2=11

17=11

You can see that this statement is false. So, what can we do to find the right answer.

We need to isolate x so we can see what it equals. To do this, we will use inverse operations.

3x+2-2=11-2

3x=9

3x/3=9/3

x=3

If we plug in 3, you will see that it does equal 11, making the equation true.

I hope this helps!

Norma-Jean [14]3 years ago

4 0

Answer:

No because 3(5) +2= 17

3*5=15

15+2= 17

Step-by-step explanation:

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3 years ago

Read 2 more answers

H(x) = -x^3-2x^2-3x+4; x=2

ioda

Answer:

h(2)=-18

Step-by-step explanation:

$h(x)=-x^3-2x^2-3x+4\\Substituting\ x=2,\\h(2)=-(2)^3-2(2)^2-3(2)+4\\h(2)=-(8)-2*4-6+4\\h(2)=-8-8-6+4\\h(2)=-22+4\\h(2)=-18$

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3 years ago

Really need help on question 8.

Diano4ka-milaya [45]

Answer:50.18

Step-by-step explanation:

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5 0

3 years ago

Alex is building a rectangle fence around his yard. the total perimeter of the fence is 68 feet and the area of his yard is 240

Alisiya [41]

Let's call the length of the rectangular fence $l$ and the width of the rectangular fence $w$ .

Based on the information in the problem, we can make two equations, based on the formulas for perimeter and area:

$A = lw$

$P = 2l + 2w$

Now, let's substitute in the values we are given in the problem:

$240 = lw$

$68 = 2l + 2w$

Now, let's solve the system using substitution.

$240 = lw \Rightarrow \dfrac{240}{w} = l$

Solve for $l$ from the first equation

$68 = 2\Bigg( \dfrac{240}{w} \Bigg) + 2w$

Substitute this value into the second equation

$68 = \dfrac{480}{w} + 2w$

Simplify

$68w = 480 + 2w^2$

Multiply both sides of the equation by $w$

$2w^2 - 68w + 480 = 0$

Subtract $68w$ from both sides of the equation

$(2w - 48)(w - 10) = 0$

Factor

$2w - 48 = 0$ and $w - 10 = 0$

Use the Zero Product Property and solve both factors

$2w - 48 = 0 \Rightarrow 2w = 48 \Rightarrow w = 24$

$w - 10 = 0 \Rightarrow w = 10$

We are given two possible lengths. However, the funny thing is that both produce the same dimensions: 24 ft by 10 ft:

$w = 24 \Rightarrow 240 = l(24) \Rightarrow l = 10$

$w = 10 \Rightarrow 240 = l(10) \Rightarrow l = 24$

Thus, our answer is Choice C, or 10 feet by 24 feet.

4 0

3 years ago