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Firlakuza [10]
3 years ago
11

If f(x) = 5x + 40, what is f(x) when x = -5? оооо

Mathematics
1 answer:
mote1985 [20]3 years ago
8 0
I think it’s 15..
cause you replace the x with -5 and solve the problem
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Answer:

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Step-by-step explanation:

in order to cancel out the logs they should have common bases

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\mathsf{ \implies  log_{5}(3x + 5) =  2 \: log_{ {5}^{2} }(1 - 3x)  }

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\mathsf{ \implies  log_{5}(3x + 5) =   \frac{1}{\cancel{2} } \times \cancel{2} \: log_{ 5}(1 - 3x)  }

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we're left with

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\mathsf{ \implies 9x = -4}

<u>x = -2/ 3</u>

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