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If $[\begin{array}{ll} 1 4 \\ 2 0 \end{array}] = [\begin{array}{ll} x y^{2} \\ z 0 \end{array}], y < 0$ then $x - y + k$ is equal to

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Correct option is A

By the equality of two matrices, x=1,y2=4,z=2⇒ x=1,y=−2,z=2 as y<0.∴ x−y+z=1+2+2=5

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If 1 42 0=x y2z 0,y<0 then x−y+k is equal to

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If $[\begin{array}{ll} 1 4 \\ 2 0 \end{array}] = [\begin{array}{ll} x y^{2} \\ z 0 \end{array}], y < 0$ then $x - y + k$ is equal to