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Natali [406]
3 years ago
12

Which value of b would make x²+bx-30 factorable? A. -31 B. -17 C. 11 D. 13

Mathematics
2 answers:
oksian1 [2.3K]3 years ago
7 0
I think the answer is. D 14
dimulka [17.4K]3 years ago
5 0

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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Answer:


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3 years ago
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Answer:

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4 0
3 years ago
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dexar [7]
This is another one for my "impossible math question" file. All of the answer choices are wrong. (None applies.)

According to the problem statement, the length you have marked "x" in the diagram is 15 inches. If the side length of one of the pavers is "s", then the Pythagorean theorem tells us
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_____
In cases like this where the answer key is incorrect, you might try asking your teacher show the class how to work the problem.
7 0
3 years ago
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3 years ago
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kotykmax [81]
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3 years ago
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