3x + 4(3x+17) = 8
3x + 12x + 68 = 8
15x = - 60
x = - 4
i am a mathematics teacher. if anything to ask please pm me
Answer:
36x
Multiply x and 9
Multiply x and 1
The x just gets copied along.
The answer is x
x
9*x evaluates to 9x
Multiply 4 and 9x
Multiply 1 and x
The x just gets copied along.
x
4*(9*x) evaluates to 36x
The final answer is
36x
A) I would make the positive integer x and then form an equation.
x + 30 = x^2 - 12
x + 42 = x^2
0 = x^2 - x - 42 this can be factorised
(x - 7) ( x + 6) Therefore x = 7 or x = -6
Since the question asks for a positive integer the answer is 7.
B) two positive numbers x and y.
X - y = 3
x^2 + y^2 = 117
Use these simultaneous equations to figure out each number.
Rearrange the first equation
x = y + 3
Then substitute it into the second equation.
(y+3)^2 + y^2 = 117
y^2 + 6y + 9 + y^2 = 117
2y^2 + 6y - 108 = 0
then factorise this.
(2y - 12) (y + 9)
This means that y = 6 or y = -9 but it’s 6 because that’s the only positive number.
Use y to find x
x = y + 3
x = 6 + 3
x = 9
So the answers are x = 9 and y = 6.
No you would not use the Pythagorean Theorem, You would take the two sides and multiply them together, and divide it by 2.
Answer:
51,760
Step-by-step explanation:
Move the decimal place 4 tens places to the right (Positively)
51,760
I hope this helped!
