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fperez616
02.03.2021 •
Mathematics
Solve the equation for x:
5x – 4 – 9x
4(x - 5)
Solved
Show answers
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Ответ:
Their are 2 answers X = 5, and X = 9
x = 5 because on both sides of your equation you have (x-5) in parenthesis and you are multiplying that number by the rest of the equation. If X = 5, then your last step on both sides of the equation will be to multiply by 0. Hence x=5.
Now X = 9. This solution will take a bit more work to solve first you will need to distribute both sides of your equation
5x(x-5) - to distribute this side of the equation simply multiply both numbers in the parenthesis by 5x (remember the subtraction sign means you will have to multiply by a negative number. So it becomes
(5x * x) + (5x * -5) Or 5x2 + -25x
The other side (4x + 9)(x -5) needs to be distributed. I tend to use the FOIL method, but the box method works well too.
(4x * x) + (4x * -5) + (9 * x) + (9 x -5)
4x2 + -20x + 9x + -45 Next add together like terms, remember you can't add an x to an x2
4x2 + -11x + -45
Okay now that we have distributed both sides I'm going to put both sides of our equation down distributed out.
5x2 + -25x = 4x2 -11x + -45
To solve for x, I need all the x's on one side of the equation, so I will use the inverse operations (remember the inverse of addition is subtraction and the inverse of multiplication is division). Whatever I do to one side of the equation has to be done to the other side to keep it balanced.
5x2 + -25x = 4x2 -11x + -45
-4x2 -4x2
x2 + -25x 0 -11x + -45
+11x +11x
x2 + -14x + 0 + 0 + -45
x2 + -14x = - 45
Ответ:
-31x + 176
Step-by-step explanation:
5x - 4 - 9 · 4 (x - 5)
= 5x - 4 - 36 (x-5)
= 5x - 4 - 36x + 180
= -31x + 176
Ответ:
Point of Interception will be (7,8/3)
Step-by-step explanation:
Point of intersection of two graph equations mean to find the value of x and y.
So,
20x - 15y = 100(1)
3x - 6y = 5(2)
Multiplying (1) with 3 and (2) with 20.
{20x - 15y = 100} * 3
= 60x - 45y = 300__(3)
&
{3x - 6y = 5} * 20
= 60x - 120y = 100_(4)
Subtracting (4) from (3),
60x - 45y = 300
60x - 120y = 100
-+-
75y = 200
y = 200/75 = 8/3
Substituting the value of y in (2)
3x - 6(8/3) = 5
3x - 16 = 5
3x = 5+16 = 21
x = 21/3 = 7
x = 7
The coordinates of interception will be x-intercept = 7 & y-intercept = 8/3.
Hope It Helped You ;)
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