MATHEMATICS HIGH SCHOOL

Y=2x squared +4x-1 . help me

Answers

Answer 1

Answer:

Answer:

y = 9/8 for part one of solving y in this equation .

Step-by-step explanation:

Answer 2

Answer:

Answer:

x= (√2y+6/2)-1

Step-by-step explanation:

Swap sides so that all variable terms are on the left hand side.

2x^2+4x−1=y

Subtract y from both sides.

2x^2+4x−1−y=0

Using quadratics formula:

x=-4±√4²-4*2(y-1)/2*2

x= −4±2√2y+6/4

Next solve the equation by using either ± = subtraction or addition

I am using ± = addition. This means I add -4 to 2. From there I simplify equation.

x= (√2y+6/2)-1

Not sure if this means to find x, but I think this is what it would be.

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What multiplies to -300 and adds to 13

Answers

25 and -12 because when you subtract 12 from 25 you will get 13 and when you multiply 25 by -12 you will get -300

25 and -12..........
Hope i helpd

Solve the problem
( SHOW your work )

10x – 3 = 8x + 5

Answers

Answer:

x =4

Step-by-step explanation:

10x – 3 = 8x + 5

Subtract 8x from each side

10x-8x – 3 = 8x-8x + 5

2x-3 =5

Add 3 to each side

2x-3+3 =5+3

2x= 8

Divide by 2

2x/2 =8/2

x =4

The work of a student to solve the equation 3(2x − 4) = 8 + 2x + 6 is shown below:Step 1: 3(2x − 4) = 8 + 2x + 6
Step 2: 5x − 7 = 14 + 2x
Step 3: 5x − 2x = 14 + 7
Step 4: 3x = 21
Step 5: x = 7

In which step did the student first make an error and what is the correct step?

Step 2; 6x − 12 = 14 + 2x
Step 2; 6x − 7 = 2(6 + x + 4)
Step 3; 5x − 2x = 14 − 7
Step 3; 5x + 2x = 14 + 7

Answers

The student made a mistake in step 2 because he added it instead of multiplying. So for step 2 the correct answer is 6x-12 =8+2x+6

(X-2)²+(y-1)²=25 how do you do this problem?

Answers

$(x-x_c)^2+(y-y_c)^2=r^2\n(x_c,y_c) - \text{center}\n\n(x-2)^2+(y-1)^2=25\n\text{center}=(2,1)\nr=√(25)=5$

Find three consecutive integers such that the sum of twice the smallest and 3 times the largest is 126.

Answers

The addition is one of the four fundamental mathematical operations. The three consecutive terms are 24, 25, 26.

What is Addition?

The addition is one of the four fundamental mathematical operations, the others being subtraction, multiplication, and division. When two whole numbers are added together, the total quantity or sum of those values is obtained.

Let the first integer be represented by x. Then the other two integers will be (x+1) and (x+2).

Since it is given that the sum of twice the smallest and 3 times the largest is 126. Therefore we can write,

2x + 3(x+2) = 126

2x + 3x + 6 = 126

5x = 126 - 6

5x = 120

x = 120/5

x = 24

Thus, the three consecutive terms are,

x = 24

x + 1 = 25

x + 2 = 26

Hence, the three consecutive terms are 24, 25, and 26.

Learn more about Addition here:

brainly.com/question/14092461

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x-smallest
y middle
z largest

x+1=y
y+1=z
2x+3z=126

2x+ 3(y+1)=126
2x+3y+3=126
2x+3(x+1)=123
5x=120
x=24

y=25

z=26

Andre received $60 for his birthday and put it in his piggy bank. Each week, he puts 3 more dollars in his bank. The amount of money in dollars D in his bank is given by D = 3w + 60, where w is the number of weeks he has saved 3 dollars. His sister Lana makes a table of reasonable values for w. Lana selects 12 as a value for w. What is the corresponding table entry for D?

A.
372

B.
96

C.
75

D.
64

Answers

96 → B

substitute w = 12 into the equation D = 3w + 60

D = (3 × 12 ) + 60 = 36 + 60 = 96

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