MadyGrace
23.11.2020 •
Mathematics
Which quadratic equation has roots –2 and 1/5?
a
5x^2 + 9x – 2 = 0
b
5x^2 – 11x + 2 = 0
c
x^2 + 4x + 4 = 0
d
5x^2 – 9x – 2 = 0
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Ответ:
The equation
has roots –2 and 1/5.
Hence, the option 'a' is the correct answer.
Step-by-step explanation:
Checking the equation
putting x = -2 in the equation
L.H.S=R.H.S
putting x = 1/5 in the equation
L.H.S=R.H.S
As putting x = -2 and x = 1/5 satisfy the equation.
Therefore, the equation
has roots –2 and 1/5.
Hence, the option 'a' is the correct answer.
Ответ:
This is because of the "triangle inequality rule", which states that the sum of two side lengths in a triangle must be greater than (not less than or equal to) than the third side length.
A + B > C
A + C > B
B + C > A