msfaybiiee9934 msfaybiiee9934

22-02-2016
Mathematics

contestada

If the value of b is 7, then what is the value of the expression -3b2 + 25 = ? A. 122 B. –122 C. 172 D. 17

Respuesta :

Amphitrite1040 Amphitrite1040

22-02-2016

-3 × 39 + 25
-147 + 25
=
-122

So this means your answer would be: B. -122

Answer Link

Exvited Exvited

22-02-2016

We first need to substitute in the value of b, which is 7.

[tex]-3(7)^2 + 25 \\ \\ -3 \times 49 + 25 \\ \\ -147 + 25 \\ \\ -122 \\ \\ [/tex]

The final result is, B) -122.

Answer Link

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