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suter [353]
3 years ago
9

I have no idea how to do this question

Mathematics
1 answer:
Korvikt [17]3 years ago
4 0
I know this doesn't really help but... Good luck on the test!! And also I'm pretty sure they have youtube vids on how to do this stuff. Well, anyway bye!!! Good luck!!!
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Find the roots of the equation <br> x^2 +7= 2x<br> express your answer in simplest a +bi form
Fittoniya [83]

x^2+7=2x\\\\\implies x^2 -2x +7 =0\\\\\text{Apply quadratic formula,}~ x =\dfrac{-b \pm \sqrt{b^2-4ac}}{2a}\\\\\text{in this case,}~ a = 1, b= -2 ~\text{and}~ c = 7\\\\\\x= \dfrac{-(-2) \pm \sqrt{(-2)^2 -4\cdot 1 \cdot 7}}{2\cdot 1}\\\\\\\implies x =\dfrac{2 \pm \sqrt{-24}}{2}\\\\\\\implies x = \dfrac{2 \pm i\sqrt{24}}2\\\\\implies x =\dfrac{2 \pm i2\sqrt{6}}2\\\\\implies x = \dfrac{2\left(1 \pm i  \sqrt 6\right)}2\\\\\implies x = 1 \pm i\sqrt 6\\\\

\text{Hence,}~ x = 1-i\sqrt 6 ~\text{or}~ x = 1+i\sqrt 6

7 0
3 years ago
The relationship among integers, natural numbers, rational numbers, and whole numbers?
Sunny_sXe [5.5K]

Answer:

Rational numbers include all integers and fractions. All negative integers and whole numbers make up the set of integers. Whole numbers comprise of all natural numbers and zero.

8 0
3 years ago
Four times a number x is at least 16
Angelina_Jolie [31]

Answer:

4

Step-by-step explanation:

4x=16

x=4

7 0
3 years ago
Read 2 more answers
I need help with #11
strojnjashka [21]
You can plug in the numbers
1) (0,3):
3 < 2(0) + 2
3 < 2 this is incorrect, so it is not 1

2) (2,0)
0 < 2(2) + 2
0 < 6 this passed the first one

0 > -(2) - 1
0 > -3 this is also correct

the answer is 2) (2,0)
4 0
3 years ago
Find all positive integers b so that the trinomial can be factored.<br> x^2+ bx + 10
Flura [38]
Bx + x^2 + 10 that is the answer i hope this helps you
8 0
3 years ago
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