All categories

3 years ago

What is the sum of 3x^3-2x+8, 2x^2+5x and x^3+2x^2-3x-3 PLEASE HELP

Mathematics

2 answers:

sdas [7]3 years ago

8 0

Answer:

The sum of given expressions is $4x^3+4x^2+5$ .

Step-by-step explanation:

The given expressions are

$3x^3-2x+8,2x^2+5x,x^3+2x^2-3x-3$

We have find the sum of all these expressions.

$3x^3-2x+8+2x^2+5x+x^3+2x^2-3x-3$

Combine like terms.

$(3x^3+x^3)+(2x^2+2x^2)+(-2x+5x-3x)+(8-3)$

$4x^3+4x^2+(0)+(5)$

$4x^3+4x^2+5$

Therefore the sum of given expressions is $4x^3+4x^2+5$ .

ss7ja [257]3 years ago

4 0

When adding/subtracting variables you can only add/subtract those variable that are of the same power....

3x^3-2x+8+2x^2+5x+x^3+2x^2-3x-3

(3x^3+x^3)+(2x^2+2x^2)+(-2x+5x-3x)+(8-3)

4x^3+4x^2+5

You might be interested in

Help me class8 (surds)

Mashcka [7]

Answer:

$\cfrac{991\sqrt{2} }{80}$

Step-by-step explanation:

For a start simplify each of the roots:

$\sqrt{72} =\sqrt{36*2} =6\sqrt{2}$
$\sqrt{50} =\sqrt{25*2} =5\sqrt{2}$
$\sqrt{128} =\sqrt{64*2} =8\sqrt{2}$
$\sqrt{98} =\sqrt{49*2} =7\sqrt{2}$

Now simplify the expression in steps:

$\sqrt{72}-\cfrac{48}{\sqrt{50} } -\cfrac{45}{\sqrt{128} } +2\sqrt{98} =$

$6\sqrt{2}-\cfrac{48}{5\sqrt{2} } -\cfrac{45}{8\sqrt{2} } +2*7\sqrt{2} =$

$6\sqrt{2}-\cfrac{48*8+45*5}{5*8\sqrt{2} } +14\sqrt{2} =$

$20\sqrt{2}-\cfrac{609}{40\sqrt{2} } =$

$20\sqrt{2}-\cfrac{609*\sqrt{2} }{40\sqrt{2} *\sqrt{2} } =$

$20\sqrt{2}-\cfrac{609\sqrt{2} }{40*2 } =$

$20\sqrt{2}-\cfrac{609\sqrt{2} }{80 } =$

$\sqrt{2} (20-7\cfrac{49}{80} )=$

$\sqrt{2} *12\cfrac{31}{80} =$

$\cfrac{991\sqrt{2} }{80}$

3 0

1 year ago

Mr. miller has $25 in his savings and wants to put $10 every week into the account. write an equation showing how much money he

iris [78.8K]

The equation you write would be linear, and would be written in slope intercept form y=mx+b. Since Mr. Miller already has $25, we plug that in for "b" in the equation. We plug 10 in for "m", because "x" represents the number of weeks he has been saving. The equation would be y=10x+25. To find how much money Mr. Miller will have in 7 weeks, plug in 7 for x. y=10(7)+25 -> y=70+25 -> y=95 -> $95

7 0

2 years ago

Parabola A can be represented using the equation (x + 3)2 = y, while Line B can be represented using the equation y = mx + 9. Is

KiRa [710]

The 1st choice is the correct one.

Isabel is correct because the y-intercept of Line B is (0, 9) and the value of y when x = 0 in Parabola A is 9.