Answer:
If D = 0, then the quadratic equation has 1 solution x = − b/2a
Step-by-step explanation:
If we have a quadratic equation x² +3x-4= 0
Then the corresponding values of a= 1, b=3, c= -4
Finding the discriminant gives
D= b2 - 4ac.
D= 3²- 4(1) (-4)
D= 9 + 16
D= 25
Here a> 0
But if a< 0 e.g a= -1
D= b2 - 4ac.
D= 3²- 4(-1) (-4)
D= 9 - 16
D= -7
Here a < 0 so we get the answer -7 < 0
D= b2 - 4ac.
D= 4²- 4(-1) (-4)
D= 16 - 16
D= 0
Here a< 0 and b= - c so that D= 0
When D < 0 roots do not exist.
If D = 0, then the quadratic equation has 1 solution x = − b/2a
This can be found out by using the quadratic formula
x= -b±√b²- 4ac/ 2a
But D= 0
x= -b±0/ 2a
x= -b/2a
Answer:
Answer is B The stone age came after the Paleolithic period
Step-by-step explanation:
Answer:
91 feet or 51
Step-by-step explanation:
17x 3= 51
51 + 40(what she dug before)
or it's just 51
Step-by-step explanation:
step 1. the x intercept is when y=0.
step 2. 2x -5(0) = 20 or x = 10.
step 3. the x intercept is (10, 0)
step 4. the y intercept is when x=0.
step 5. 2(0) - 5y = 20 or y = -4
step 6. the y intercept is (0, -4).
Answer:
321.65
Step-by-step explanation:
12 x 10.5 = 126
14.5 x 13.5 = 195.65