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Several exercises in the first volume of ninth grade mathematics published by People's Education Press. Urgent! ! Please. !
1)x^2+ 10x+ 16=0

x^2+ 10x+25=- 16

(x+5)^2=- 16

x+5=+/-4i

x=+/-4i-5

2)x^2-x-3/4=0

x^2-x+ 1/4=3/4

4x^2-4x+ 1=3

(2x- 1)^2=3

2x- 1=+/-√3

x=(+/-√3+ 1)/2

4) 4x^2-x-9=0

4x^2-x+ 1/ 16=9

(2x- 1/2)^2=9

2x- 1/2=+/-3

x=(+/-3+ 1/2)/2

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