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Reil [10]
2 years ago
15

Please help me i need it -_-

Mathematics
1 answer:
Natasha2012 [34]2 years ago
7 0
The answer to your question is option b
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2 years ago
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Which value of b would make x²+bx-30 factorable?<br> A. -31<br> B. -17<br> C. 11<br> D. 13
dimulka [17.4K]

Answer:

D. 13

Step-by-step explanation:

well since it's a quadratic equation, it can be written in the form of ax²+bx+c=0. So we have a=1, b=b and c= -30. Also the roots are given by the equation-

x= -b±\sqrt{b^{2}-4ac} /2a. So all I did was put the number from the choices which would satisfy the sqrt part and that turned out to be 13 since \sqrt{13^{2}-4*1*(-30) = \sqrt{289} = 17. So b=13.

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3 years ago
Question 28 (1 point)
aniked [119]

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+ 16

Step-by-step explanation:

x² - 8x = - 10

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add ( half the coefficient of the x- term )² to both sides

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2 years ago
A- 7 = 3(+2) What is a
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a = 13

Step-by-step explanation:

Hello!! This is how you do it!!

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+ 7. +7

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