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Nataliya [291]
2 years ago
8

Solve for x.

Mathematics
2 answers:
Ostrovityanka [42]2 years ago
3 0

Answer:

C.  3, -7

Step-by-step explanation:

x^2 +4x-21 =0

Factor

What 2 numbers multiply to -21 and add to 4

7*-3 = -21

7-3 = 4

(x+7) (x-3) =0

Using the zero product property

x+7 =0       x-3=0

x+7-7=0-7     x-3+3=0+3

x = -7            x=3

Arada [10]2 years ago
3 0

Answer:

<h2>C. 3, -7</h2>

Step-by-step explanation:

x^2+4x-21=0\\\\x^2+7x-3x-21=0\\\\x(x+7)-3(x+7)=0\\\\(x+7)(x-3)=0\iff x+7=0\ \vee\ x-3=0\\\\x+7=0\qquad\text{subtract 7 from both sides}\\x=-7\\\\x-3=0\qquad\text{add 3 to both sides}\\x=3

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Need help with Number 11.Show your work plz.Please answer Quick.
Zanzabum
Jennifer earns $5.50 per hour

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To find out how many hours they'd have to work to make 50$, we would just divide $50 by their hourly wage.

Jennifer=50/5.50=9.09 hours    since you cant have 0.09 hours round up
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