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1 Jawaban
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1. Jawaban whongaliem
limit (3x^5 + 2x^4 - 3x + 5) = 3(-1)^5 + 2(-1)^4 - 3(-1) + 5
x⇒ - 1
= 3 (-1) + 2 (1) + 3 + 5
= - 3 + 2 + 8
= 7
[tex]b) \lim_{x \to \ - 5} \frac{5x - 3}{ \sqrt{ x^{2} - 3x + 9} } = \frac{5(-5) - 3}{ \sqrt{ (-5)^{2} } - 3(-5) + 9} [/tex]
[tex]= \frac{- 25 - 3}{ \sqrt{25 + 15 + 9} } [/tex]
[tex]= \frac{- 28}{ \sqrt{49} } [/tex]
[tex]= \frac{- 28}{7} [/tex]
= - 4
2) limit (x² - 5x +( a + 7)) = - 5
x⇒3
3² - 5(3) + a + 7 = - 5
9 - 15 + a + 7 = - 5
a + 1 = - 5
a = - 5 - 1
a = - 6
b) limit (x² + 3x - 10 = 8
x⇒a
a² + 3a - 10 = 8
a² + 3a - 10 - 8 = 0
a² + 3a - 18 = 0
(a - 3)(a + 6) = 0
a - 3 = 0 atau a + 6 = 0
a = 3 atau a = - 6