03 Jul, 2021 08:47 PM

If 5x + x² > 100, then x is not?

If 5x + x² > 100, then x is not? Need this problem solved If 5x + x² > 100, then x is not These are my answer options I just cannot get them to work logically please help. A: 10 B: 8 C: 7 D: 9

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KA
03 Jul, 2021 08:48 PM

Notice if x=7 then 5*7+7^2=35+49=84...  So x is not 7

PR
03 Jul, 2021 08:48 PM

If you plug in each answer for the value of x, then answer C (the number 7) is the only one that works.  If 5x + x^2 cannot be greater than 100, then 5(7) + (7)^2 = 84, which is less than 100.  All other answers give a number greater than 100, which makes the inequality work.