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4 years ago

Can someone help me solve these

Mathematics

2 answers:

Ierofanga [76]4 years ago

5 0

#2 the answer is 3 because -17=x-20
-x=-20+17
-x=-3

#4 the answer is 9 because x=14-5
x=9

#6 the answer is 2 because x=7-5
x=2
#8 the answer is 14 because -n=6-20

#10 the answer is -2because 3 divided by 6 is 2 and then a positive divided by a negative is a negative so -2

Alex_Xolod [135]4 years ago

3 0

Subtract the number with x to get your answer.

Like for #6 you would do 7-5 which is 2, so x=2

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andreev551 [17]

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Step-by-step explanation:

The given equation is $x^{2}+3x+4=0$ .

We need to find the solution of the above equation.

The solution of an equation $ax^2+bx+c=0$ is :

$x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}$

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$x=\dfrac{-3+ \sqrt{(3)^2-4(1)(4)} }{2}, \dfrac{-3- \sqrt{(3)^2-4(1)(4)} }{2}\\\\=\dfrac{-3+\sqrt{9-16}}{2}, \dfrac{-3-\sqrt{9-16}}{2}\\\\=\dfrac{-3\pm \sqrt7i}{2}$

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