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Oliga [24]
4 years ago
13

What are the roots of the equation? x2−x−42=0 Enter your answers in the boxes.

Mathematics
1 answer:
Levart [38]4 years ago
8 0

Answer:

x = 7  x = -6

Step-by-step explanation:

x^2−x−42=0

Factor

What two numbers multiply to -42 and add to -1

-7*6 = -42

-7+6 = -1

(x-7) (x+6) =0

Using the zero product property

x-7 =0   x+6 =0

x = 7  x = -6

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Y = 2x + 5<br> Whats the answer for this? Whats the missing value <br> (2,__)
Anna35 [415]

Answer:

(-5/2, 5)

Step-by-step explanation:

Apply x-y intercepts theorem

(x,y)=(0,y) and (x,0).

then substitutes.

5 0
3 years ago
If 2x + 5y = -5 what is x if y = -5<br> HELP ASAP
mash [69]

Answer:

x=10

Step-by-step explanation:

first substitute y with the value (-5)

2x+5(-5)=-5 which is simplified to 2x+-25=-5

add 25 to -5 which gives you 2x=20

then divide 20 by 2 which makes x=10

7 0
3 years ago
9. If the area of a square is given by the polynomial 4x2 – 36x + 81, then which of the
AnnyKZ [126]

Answer:

If the area of a square is given by the polynomial 4x2 – 36x + 81, then which of the

following expressions represents the length of one side of the square?

A 2x -9

B

2x + 9

C 4x - 18

D 4x + 18

Step-by-step explanation:

answer 4x+18

3 0
3 years ago
IMPORTANT PLEASE I NEED NOW:Find the area of each face of the cube whose volume is 729 cm
vivado [14]

Answer:

81

Step-by-step explanation:

square root of 729= 9

9×9=81

8 0
3 years ago
Read 2 more answers
What is the equation of the axis of symmetry do the quadratic function f(x) = -(x+4) (x-1)​
miv72 [106K]

9514 1404 393

Answer:

  x = -3/2

Step-by-step explanation:

The zeros of the function are the values of x that make the factors zero:

  x = -4, x = 1

The axis of symmetry is the vertical line halfway between these zeros.

  x = (-4 +1)/2 = -3/2

The equation of the axis of symmetry is x = -3/2.

8 0
3 years ago
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