Question

EXERCISE - 3.3
Find the zeroes of the following quadratic polynomials and verify the relationship between
the zeroes and the coefficients.
(i) x2 - 2x - 8
(ii) 4.s2 -- 4s + 1
(iii) 6x2 – 3-7x
(iv) 4u2 + 8u
(v) † - 15
(vi) 3x2 - x - 4​

Answer 1

Answer:

which class

Step-by-step explanation:

plaese tell me

Answer 2

Answer:

Step-by-step explanation:

i) x²-2x-8 = x²+2x-4x-8 = x(x+2) -4(x+2) = (x-4)(x+2)

(x-4) = 0         (x+2) = 0

x = 4                x = -2

Zeroes = 4,-2

ii) 4s²-4s+1 =4s²-2s-2s+1 = 2s(2s-1) -1(2s-1) = (2s-1)(2s-1)

2s-1 = 0

2s = 1

s = 1/2

Zero = 1/2

iii) 6x²-7x-3 = 6x²+2x-9x-3 = 2x(3x+1) -3(3x+1) = (2x-3)(3x+1)

2x-3 = 0           3x+1 = 0

x = 3/2               x = -1/3

Zeroes = 3/2, -1/3

iv)4u²+8u = (4u)(u+2)

u+2 = 0      4u = 0

u = -2           u = 0

Zeroes = -2, 0

vi) 3x²-x-4 = 3x²+3x-4x-4 = 3x(x+1) -4(x+1) = (3x-4)(x+1)

3x-4 = 0         x+1 = 0

x = 4/3            x = -1

Zeroes = 4/3, -1