Oblicz wartość wyrażenia dla podanej wartości zmiennej:
a) x^3-4x , x=√7
b) 3x-2x^3 , x=√5
c) 2x-3x^3+4x^5 , x=√2
d) -x^5+4x^3+8 , x=-√2
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a) x³-4x , x=√7
(√7)³-4*√7=7√7-4√7=3√7
b) 3x-2x³ , x=√5
3*√5-2*(√5)²=3√5-10
c) 2x-3x³+4x^5 , x=√2
2*√2-3*(√2)³+4*(√2)^5=2√2-6√2+4*4√5=12√5
d) -x^5+4x³+8 , x=-√2
(√2)^5+4*(-√2)³+8=4√2-8√2+8=-4√2+8
a) x^3-4x , x=√7
(√7)³-4√7=7√7-4√7=3√7
b) 3x-2x^3 , x=√5
3√5-2*(√5)³=3√5-10√5=-7√5
c) 2x-3x^3+4x^5 , x=√2
2√2-3*(√2)³+4*(√2)^5=2√2-6√2+16√2=12√2
d) -x^5+4x^3+8 , x=-√2
-(-√2)^5+4*(-√2)³+8=4√2-8√2+8=-4√2+8