Which of the following is a quadratic equation?
A.
[tex]2 { \times }^{2} + 4r \: - 1 [/tex]
B.
[tex]3t - 7 = 2[/tex]
C.
[tex] {s}^{2} + 5s \: - 4 = 0[/tex]
D.
[tex]2 { \times }^{2} - 7 \times \geqslant 3[/tex]
A.
[tex]2 { \times }^{2} + 4r \: - 1 [/tex]
B.
[tex]3t - 7 = 2[/tex]
C.
[tex] {s}^{2} + 5s \: - 4 = 0[/tex]
D.
[tex]2 { \times }^{2} - 7 \times \geqslant 3[/tex]
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Answer:
s²+5s-4=0
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Answer:
A,
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