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egoroff_w [7]
3 years ago
9

(3x+1)(x +4) solve into standard form showing all steps

Mathematics
1 answer:
Tom [10]3 years ago
5 0

Answer:

3x^2+13x+4

Step-by-step explanation:

Use FOIL (First Outer Inner Last) and expand

3x^2+12x+x+4

=3x^2+13x+4

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2 years ago
If y varies directly with x and y = 2 when x = 10, then what is the value of y when x = 40? 200 45 320 8
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3x - 2y + 3z = -20<br> 4x - 3y - 2z = 7<br> -5x + 5y + z = 9
skelet666 [1.2K]

Answer:

x= 4 y= 7 z= -6

Step-by-step explanation:

solve for one and you get them all

First, I got rid of the z by multiplying common factors (multiplied z by 2) and added equations 2 and 3 together after multiplying by 2

4x - 3y - 2z = 7

-10x+10y+2z= 18

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Then multiplied z by -3 (to get rid of the z) with the original equation 3

3x - 2y + 3z = -20

15x-15y-3z= -27

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Next find common thing between the 2 equations we got and multiply it by that and combine (we can multiply first equation by 3 to get rid of the x and solve for y)

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Work backwards, substitute 7 into the above equation, you get x= 4 and then same for z to get z= -6

8 0
3 years ago
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