Simplify 7x + (x – 4)(x + 5) – 5x. 0
x² + x - 20
-
0
x² + 3x – 20
* x2-3x - 20
O X
x² – – 20

x² + 3x - 20

Step-by-step explanation:

7x + (x-4)(x+5) - 5x

2x + (x² + x – 20)

2x + x² + x - 20

x² + 3x - 20

idk what the heck he answer is, i’m just putting this here so i finish my account

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

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3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !