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kari74 [83]
2 years ago
13

Can somebody solve this

Mathematics
1 answer:
Nikolay [14]2 years ago
8 0

Answer:

36

Step-by-step explanation:

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A tutoring company has offices where students physically attend a test prep course. The company recently created an online test
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Some of the 50 students should have been assigned to a control group that used the in-person course

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X^2=4x-15 solve with Quadratic formula
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Answer:

x=2+i\sqrt{11}

x=2-i\sqrt{11}

Step-by-step explanation:

we have

x^{2} =4x-15 -------> x^{2}-4x+15=0

we know that

The formula to solve a quadratic equation of the form ax^{2} +bx+c=0 is equal to

x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}

in this problem we have

x^{2}-4x+15=0

so

a=1\\b=-4\\c=15

substitute in the formula

x=\frac{-(-4)(+/-)\sqrt{-4^{2}-4(1)(15)}} {2(1)}

x=\frac{4(+/-)\sqrt{16-60}} {2}

Remember that

i=\sqrt{-1}

x=\frac{4(+/-)\sqrt{-44}} {2}

x=\frac{4(+/-)2i\sqrt{11}} {2}

x=\frac{4(+)2i\sqrt{11}}{2}=2+i\sqrt{11}

x=\frac{4(-)2i\sqrt{11}}{2}=2-i\sqrt{11}

7 0
3 years ago
Table A, B, C, Or D???<br> I’ll give brainlest
Aleks04 [339]

Answer:

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Step-by-step explanation:

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