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3 years ago

How do i solve this 4x-9=7x+12

Mathematics

2 answers:

zzz [600]3 years ago

6 0

Answer:

x = -7

Step-by-step explanation:

Combine like terms: (Subtract 4x from both sides, and subtract 12 from both sides)

4x - 9 = 7x + 12

-9 - 12 = 7x - 4x

-21 = 3x

Divide by 3:

-21 = 3x

x = -21 / 3

x = -7

Plug in to check your answer:

4x - 9 = 4(-7) - 9 = -37

7x + 12 = 7(-7) + 12 = -37

ddd [48]3 years ago

5 0

Answer:

x = -7

Step-by-step explanation:

4x - 9 = 7x + 12

~Add 9 to both sides

4x = 7x + 21

~Subtract 7x to both sides

-3x = 21

~Divide -3 to both sides

x = -7

Best of Luck!

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VMariaS [17]

Answer:

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Step-by-step explanation:

(8x-30)+6x+(2x+10)

8x-30+6x+2x+10

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3 0

3 years ago

Find all the zeroes of the equation(with simple steps).

uysha [10]

Answer-

The zeros are, $5,\ -5,\ 4i,\ -4i$

Solution-

$\Rightarrow -3x^4+27x^2+1200=0$

$\Rightarrow -3(x^2)^2+27(x^2)+1200=0$

Here,

a = -3, b = 27, c = 1200

So,

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

$=\dfrac{-27\pm \sqrt{-27^2-4\cdot (-3)\cdot 1200}}{2\cdot (-3)}$

$=\dfrac{-27\pm \sqrt{729+14400}}{-6}$

$=\dfrac{-27\pm 123}{-6}$

$=\dfrac{-27+123}{-6},\ \dfrac{-27- 123}{-6}$

$=\dfrac{96}{-6},\ \dfrac{-150}{-6}$

$=-16,\ 25$

So,

$\Rightarrow x^2=25,\ -16$

$\Rightarrow x=\sqrt{25},\ \sqrt{-16}$

$\Rightarrow x=5,\ -5,\ 4i,\ -4i$

8 0

3 years ago

PLS HELP..DUE IN LIKE 2 MINUTES The coordinates of the endpoints of CE are C(-3, -7) and E(7,-2). Point M(3,-4) is in CE. What i

TiliK225 [7]

Answer: 3:2
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7 0

3 years ago

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jenyasd209 [6]

Haven't done this in awhile but i got
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3 years ago

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White raven [17]

Answer:

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Step-by-step explanation:

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5 0

3 years ago