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lara [203]
3 years ago
8

Problem 3. if f(x) = /2x-5 and g(x) = 5x? -- 3, find (gºf)(x). (Step by step please<3)

Mathematics
1 answer:
kramer3 years ago
8 0

(1) <em>f(x)</em> = <em>x</em>² - 4<em>x</em> + 2, <em>g(x)</em> = 3<em>x</em> - 7

<em>(f</em> o<em> g) (x)</em> = <em>f(g(x))</em> = <em>f</em> (3<em>x</em> - 7)

= (3<em>x</em> - 7)² - 4(3<em>x</em> - 7) + 2

= (9<em>x</em>² - 42<em>x</em> + 49) + (-12<em>x</em> + 28) + 2

= 9<em>x</em>² - 57<em>x</em> + 79

(2) <em>g(x)</em> = -6<em>x</em> + 5, <em>h(x)</em> = -9<em>x</em> - 11

<em>(g</em> o <em>h) (x)</em> = <em>g(h(x))</em> = <em>g</em> (-9<em>x</em> - 11)

= -6(-9<em>x</em> - 11) + 5

= 54<em>x</em> + 66 + 5

= 54<em>x</em> + 71

(3) <em>f(x)</em> = √(2<em>x</em> - 5), <em>g(x)</em> = 5<em>x</em>² - 3

<em>(g</em> o <em>f) (x)</em> = <em>g(f(x))</em> = <em>g</em>(√(2<em>x</em> - 5))

= 5 (√(2<em>x</em> - 5))² - 3

= 5 (2<em>x</em> - 5) - 3

= 10<em>x</em> - 25 - 3

= 10<em>x</em> - 28

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