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In each of the following equations, find the value of
W unknown constant(s) for which the given value (s) is (are) solution of the equations.
(i) \( x^{2}-k^{2}=0, x=0.3 \)
(ii) \( 3 x^{2}+2 a x-3=0 ; x=\frac{-1}{2} \)
(iii) \( 7 x^{2}+k x-3=0 ; x=\frac{2}{3} \)
(iv) \( k x^{2}+\sqrt{2} x-4=0 ; x=\sqrt{2} \)
(v) \( a x^{2}+b x+1=0 ; x=1, x=2 \)
(vi) \( 5 x^{2}+p x+q=0 ; x=-2, x=-\frac{1}{5} \)
(vii) \( a x^{2}+b x-6=0 ; x=\frac{3}{4}, x=-2 \)
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