We will use the substitution:
t = x² ;
t² + 21 x - 100 = 0
t² + 25 t - 4 t - 100 = 0
t ( t + 25 ) - 4 ( t + 25 ) = 0
( t + 25 ) ( t - 4 ) = 0
t 1 = - 25, t 2 = 4
x = √t
Answer:
The roots are:
x 1 = 5 i
x 2 = - 5 i
x 3 = - 2
x 4 = 2
Basically, all we have to do is divide 150 by 4.
150/4 = 37.5
Because there can’t be a half leap day, there are 37 leap days in a 150 year period.
Well 9/5 (basically 9 divided by 5) is 1.8 so -1.809 - 1.8 is -3.609
Answer:
The solution to the equation is:
- <u>x = 2.5</u> or <u>x = 5/2</u>
Step-by-step explanation:
To find the solution to the equation, you only must operate the equation until you clear the x variable, with the next steps:
And we solve:
- 4x + 28 = 38 (we multiply 4 by x and 7)
- 4x = 38 - 28 (we pass the +28 to subtract to the right side of the equality and operate)
- x = 10 / 4 (we pass the 4 that is multiplying to divide to the right side of the equality)
- <u>x = 2.5</u> (we divide)
As you can see, <u><em>the solution of the equation is </em></u><u><em>x = 2.5</em></u><u><em> or </em></u><u><em>x = 5/2</em></u>
Answers :
0.85= 85/100 -because of the two numbers on the right hand side. Then (divide by 5) 85/5, 100/5= 17/20
2116/100- divide by 4 for 2116/100. 2116/4, 100/4= 529/25
22.15= 22 15/100 = 22 divide by 5 for 15/100. 22 3/20. Multiplied 22*20=440
Then add 440 with the numerator. 440+3=433/20
