Question

      (i)    𝑦= 2𝑥² + 12𝑥 + 18

Answer 1

Let y = 0

2x² +12x + 18= 0

0 = 2x² + 12x + 18

0 = x² + 6x +9

0 = x² + 3x + 3x +9

0 = x(x+3) + 3(x+3)

0 = (x+3)(x+3)

x+3 =0

x = -3

Therefore, y= 0, x = -3