Question

cine imi poate rezolva aceste exercitii : f(x)= xla a doua -5x si f(x)=-x la a doua +4x+5

Answer 1

1.f(2)= 2 la a 2 a - 5 ori 2
f(2)= 4 -10
f(2)=-6
f(5)= 5 la a 2 a - 5 ori 5
f(5)= 25-25
f(5)= 0
2.f(0)= - 0 la a 2 a + 4 ori 0  + 5
f(0)=  0+ 0+ 5
f(0)=5
f(1)= - 1 la a 2 a + 4 ori 1 +5
f(1)=1 +4+5
f(1)=10
Sper sa intelegi.

Answer 2

$1) f(x)= x^{2} -5x \\ x^{2} -5x=0 \\ x(x-5)=0 \\ x_{1} =0 \\ x_{2} =5 \\ \\ 2)f(x)=- x^{2} +4x+5 \\ - x^{2} +4x+5=0 \\ - x^{2} +4x+4+1=0 \\ 1-x^{2} +4(x+1)=0 \\ (1-x)(1+x)+4(1+x)=0 \\ (1+x)(5-x)=0 \\ x_{1} =-1 \\ x_{2} =5$

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