-30=-2(-n + 3) Only number not variable

Mathematics

2 answers:

shutvik [7]2 years ago

7 0

Answer:

n=12

Step-by-step explanation:

I'm assuming you want to solve for <em>n</em>

First, you must use distributive property:

-30=-2n-6

Then, add 6 to both sides

-24=-2n

Finally, you must divide by -2

12=n

Lostsunrise [7]2 years ago

6 0

Correct answer is n = -12

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3 years ago

Factor the quadratic equation below to reveal the solutions. X^2+4x-21=-9

a_sh-v [17]

Answer:

x = 3 and x = -7

Step-by-step explanation:

The given quadratic equation is $x^2+4x-21=0$ . We need to find the solution of this equation.

If the equation is in the form of $ax^2+bx+c=0$ , then its solutions are given by :

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

Here, a = 1, b = 4 and c = -21

Plugging all the values in the value of x, such that :

$x=\dfrac{-b+ \sqrt{b^2-4ac} }{2a},\dfrac{-b- \sqrt{b^2-4ac} }{2a}\\\\x=\dfrac{-4+ \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)},\dfrac{-4- \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)}\\\\x=3, -7$