Find the zeroes of the following quadratic polynomials and verify the relationship between the zeroes and the coefficients.
6x2 – x – 2
To find the zeros of the polynomial let us first solve the polynomial by equating it to zero. Factorizing the given polynomial
6x2 – x - 2 = 0
To factorize the polynomial we have,
Sum of the value should be equal = -1
Product should be equal to = 6 × (-2)
= -12
So two numbers are -4, 3
6x2 – 4x + 3x - 2 = 0
2x (3x – 2) + 1(3x – 2) = 0
(2x+1)(3x-2) = 0
2x+1 = 0 or 3x-2 = 0
Now Solving first part,
2x+1 = 0
2x = -1
x = -1/2
Now solving the second part,
3x-2 = 0
3x = 2
x = 2/3
When we compare the above quadratic equation with the generalized one we get,
ax2 + bx + c = 0
∴ a = 6, b = -1, c = -2
Sum of zeroes = -b / a
= - (-1) / 6
= 1/6
Product of zeroes = c / a
= -2 / 6
= -1/3
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