9x^2-7x+k=(3x)^2-2*3x*k^(1/2)+ (k^(1/2))^2 => 2*3x*k^(1/2)=7x
=>6k^(1/2)=7 => k^(1/2)=7/6 => k=(7/6)^2=49/36
9x^2 - 7x +(7/6)^2=(3x - 7/6)^2
Объяснение:
9x^2-7x+k=(3x)^2-2*3x*k^(1/2)+ (k^(1/2))^2 => 2*3x*k^(1/2)=7x
=>6k^(1/2)=7 => k^(1/2)=7/6 => k=(7/6)^2=49/36
9x^2 - 7x +(7/6)^2=(3x - 7/6)^2
Объяснение: