solve the following by completing square method
x²+8x-11=0
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Answer:
x² + 8x - 11 = 0
⇒ x² + 8x = 11
⇒ x² + 8x + 4² = 11 + 4² ( use 4 because it is 8/2 )
⇒ ( x + 4 )² = 11 + 16 = 27
⇒ x + 4 = ±√27 = ±3√3
⇒ x = -4 ± 3√3
Hope that helps!
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