(i) Given: x2 + 2x + 1 = 0
On comparing this equation with the standard form of the quadratic equation ax2 + bx + c = 0, we get:
a = 1, b = 2 and c = 1
(ii) Given: 2x2 – x + 3 = 0
On comparing this equation with the standard form of the quadratic equation ax2 + bx + c = 0, we get:
a = 2, b = –1 and c = 3
(iii) Given: x2 – x – 3 = 0
On comparing this equation with the standard form of the quadratic equation ax2 + bx + c = 0, we get:
a = 1, b = –1 and c = –3
(iv) Given: x2 + 5x – 4 = 0
On comparing this equation with the standard form of the quadratic equation ax2 + bx + c = 0, we get:
a = 1, b = 5 and c = –4
(v) Given: x2 – 7x + 4 = 0
On comparing this equation with the standard form of the quadratic equation ax2 + bx + c = 0, we get:
a = 1, b = –7 and c = 4
(vi) Given: 4x2 – 9x + 1 = 0
On comparing this equation with the standard form of the quadratic equation ax2 + bx + c = 0, we get:
a = 4, b = –9 and c = 1