Answer:
2x = -5 +/- root 5 (opt 3)
Step-by-step explanation:
0 = 4f(x)
= 4(x^2 + 5x + 5)
= 4x^2 + 20x + 20
= (2x)^2 + 2*2x+5 + 25 - 5
= (2x + 5)^2 - (root 5)^2
= ((2x+5) - 5) ((2x + 5) + 5)
= (2x + 5 - 5) (2x + 5 - 5)
Therefore, 2x = -5 +/- root 5
Hope u understand.
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