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If-k-gt-0-and-f-x-x-x-Find-f-2-7-k-f-2k-

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Question Number 185693 by Shrinava last updated on 25/Jan/23
If k > 0 and f(x) = (x/(∣x∣)) Find f(- (2/7) k) + f( - 2k) = ?
Ifk>0andf(x)=x∣x∣Findf(−27k)+f(−2k)=?
Commented by Shrinava last updated on 25/Jan/23
a)2,5 b)3,5 c)4,5 d)3 e)4
a)2,5b)3,5c)4,5d)3e)4
Answered by HeferH last updated on 25/Jan/23
f(x) = (x/(∣x∣)) { ((−1, x < 0 )),((1, x > 0)) :} k > 0 ⇒ ((−2k)/7) < 0 ∧ −2k < 0 f(((−2k)/7)) + f(−2k) = −2
f(x)=x∣x∣{−1,x<01,x>0k>0⇒−2k7<0∧−2k<0f(−2k7)+f(−2k)=−2

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