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3 years ago

Please help( I will mark brainliest )

Mathematics

1 answer:

Anni [7]3 years ago

4 0

Answer:

umm i think A C D E ?

Step-by-step explanation:

because theyre all the same. some is just distribution. you should wait for another opinion though because im too lazy to check for B

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Use substitution to solve the system of equations. 2x+4=32 and -2x-6y= -44

Yakvenalex [24]

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3 years ago

Solve using the elimination method -4x-2y=-18

Softa [21]

Step-by-step explanation:

-4x – 2y= -18

Add 2y to both sides

-4x- 2y+ 2y = -18 + 2y

Simplify

-4x = -18 + 2y

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2 years ago

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3 years ago

What are the solutions of x2 -2x+2=0

sergejj [24]

Answer: x = 1 ± i

Step-by-step explanation:

Solving the quadratic equation using the quadratic formula:

x = $\frac{-b+\sqrt{b^{2}-4ac } }{2a}$ or $\frac{-b-\sqrt{b^{2}-4ac } }{2a}$

From the question :

a = 1

b = -2

c = 2

substituting inside the formula

X = $\frac{-(-2)+\sqrt{(-2)^{2}-4(1)(2) } }{2(1)}$ or

$\frac{-(-2) - \sqrt{2^{2}-4(1)(2) } }{2(1)}$

x = $\frac{2 + \sqrt{4-8} }{2}$ or $\frac{2 - \sqrt{4-8} }{2}$

x = $\frac{2 + \sqrt{-4} }{2}$ or $\frac{2 - \sqrt{-4} }{2}$

Recall ; $\sqrt{-4}$ can be written as $\sqrt{-1}$ X $\sqrt{4}$ , and $\sqrt{-1}$ = i

Substituting this

x = $\frac{2+2i}{2}$ or $\frac{2-2i}{2}$

simplifying, we have

x = 1 + i or 1 - i

3 0

3 years ago

Heather says that the expressions 4 x minus 2 x plus 8 and 2 left parenthesis x plus 4 right parenthesis are not equivalent beca

Alexxx [7]

Yes, Heather is correct. The expressions are not equivalent

Solution:

Given that,

Heather says, the following expressions are not equivalent

$4x - 2x + 8\ and\ 2(x-4)$

Because one expression has a term that is subtracted and the other does not

Combine the like terms in first expression:

$4x - 2x + 8 = 2x +8$

Let us first expand the second expression

By distributive property

a(b + c) = ab + bc

Therefore,

$2(x-4) = 2x - 8$

Thus the two expressions are:

$2x + 8\ and\ 2x-8$

Yes both the expressions are not equivalent

Because, in first expression 2x is added to 8

But in second expression, 8 is subtracted from 2x

Thus heather is correct

3 0

4 years ago