y = x 2 + 18x + 70. (i) Write the quadratic expression x 2 + 18x
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Question:
y = x 2 + 18x + 70.
(i) Write the quadratic expression x 2 + 18x + 70 in completed-square form.
[2] (ii) Use the completed-square form from part (c)
(i) to solve the equation x 2 + 18x + 70 = 0, leaving your answer in exact (surd) form.
[3] (iii) Use the completed-square form from part (c)
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