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Convert y=X2 + 4x + 3 from standard form to vertex form

Verified Answer :

ghanami

Hello : 
x²+4x+3 = x²+2(2x)+4-4+3
              = (x²+2(2x)+2²) -1
x²+4x+3 = (x+2)² -1 ....(vertex form )    the vertex is : A( -2 ; -1)

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