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denis23 [38]
3 years ago
14

oyce is trying to solve the equation y = x2 − 8x + 7 using the quadratic formula. She has made an error in one of the steps belo

w. Find the step where Joyce went wrong.
Mathematics
1 answer:
Naddik [55]3 years ago
3 0

You didn't attach anything, but this is how you should solve this equation: given an equation ax^2+bx+c=0 the solutions are

x_{1,2} = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

In your case, the values are a=1,\ b=-8,\ c=7. If you plug these values inside the solving formula, you have

x_{1,2} = \dfrac{8\pm\sqrt{64-4\cdot 1\cdot 7}}{2\cdot 1} = \dfrac{8\pm\sqrt{64-28}}{2} = \dfrac{8\pm\sqrt{36}}{2} = \dfrac{8\pm6}{2} = 4\pm3

So, the two solutions are 1 and 7

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can someone please help me?!
stealth61 [152]

Answer:

z = 92

x = 11

Step-by-step explanation:

From the figure,

13x - 55 = 88 (Opposite angles made by two straight lines are equal)

13x = 88 + 55

13x = 143

x = 143/13

x = 11

Again,

88 + z = 180 (Sum of angles of a straight line)

z = 180 - 88

z = 92

5 0
3 years ago
Read 2 more answers
Mr. Chavez's third-graders go to gym class at 11:15. Students rotate through three activities for 8 minute each. Lunch begins at
bonufazy [111]

21 minutes is the answer because there's 45 minutes between 11: 15 and 12:00 and the 3 activities for eight minutes (8 x 3 = 24) so 45 - 24 = 21 minutes


8 0
4 years ago
Which of the following equations is equivalent to
andrew-mc [135]

Answer:

B. y=3x+12

Step-by-step explanation:

Hi there!

We want to find out which equation is equivalent to -6x+2y=24

The equation is currently written in standard form, which is ax+by=c, where a, b, and c are integer coefficients, but a and b CANNOT equal zero

We can change the equation into slope-intercept form, which is y=mx+b, where m is the slope and b is the y intercept, as all of the answer options are in slope-intercept form.

To do that, we'll need to isolate y by itself on one side

So let's add 6x to both sides to remove it from the left side

-6x+2y=24

+6x        +6x

__________________

     2y=6x+24

Now divide both sides by 2 to get the value of y by itself (1y)

y=3x+12

The answer is B. y=3x+12

Hope this helps!

5 0
3 years ago
Please help me out tysm plzzzzz
Natasha_Volkova [10]

Answer:

purrrrrrrrrrrrrrrrrrrrrrrr

Step-by-step explanation:

6 0
4 years ago
Read 2 more answers
George runs 3 1/2 laps around a circular track with a diameter of 1/2 mile. About how far does George run?
ludmilkaskok [199]

Answer:

About 5.495 miles

Step-by-step explanation:

0.5 • 3.14 = 1.57

1.57 • 3.5 = 5.495

3 0
3 years ago
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