Kai Chew's answer to Macdaddy's Secondary 3 E Maths Singapore question.
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c) By completing the square:
y = x^2 + 2x -3
y = x^2 + 2x + (2/2)^2 - (2/2)^2 - 3
y = (x+1)^2 - 4
Turning point: (-1, -4)
Since line of symmetry = to vertical line passing through the turning point, x= -1 is the line of symmetry.
y = x^2 + 2x -3
y = x^2 + 2x + (2/2)^2 - (2/2)^2 - 3
y = (x+1)^2 - 4
Turning point: (-1, -4)
Since line of symmetry = to vertical line passing through the turning point, x= -1 is the line of symmetry.
Date Posted:
2 years ago
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