Q. 3 A4.7( 3 Votes )

# Attempt any three

Answer :

Given: z2 + 4z-7 = 0

z2 + 4z -7 = 0

Now, we can write this equation as

(z)2 + 2 × 2 × Z - 7 = 0

(z)2 + 2 × 2 × z - 7 + 4 - 4 = 0

(z)2 + 2 × 2 × z + 4 - 11 = 0

(z + 2)2 - (√11)2 = 0

(z + 2 + √11) (z + 2 - √11) = 0

Hence,

z = -2 - √11 or -2 + √11

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