Question

giúp tớ bài này với các cậu :D, mình tíck cho, thanksss !! ^^

Answer 1

a: f(-1)=5-3=2

f(3/2)=-15/2-3=-21/2

b: y=-8 thì -5x-3=-8

=>-5x=-5

hay x=1

y=0 thì -5x-3=0

=>-5x=3

hay x=-3/5

Answer 2

\(a.f\left(-1\right)=\left(-5\right).\left(-1\right)-3=5-3=2\\ f\left(\dfrac{3}{2}\right)=\left(-5\right).\dfrac{3}{2}-3=-\dfrac{15}{2}-3=-12\)

Answer 3

a. f(-1) y=-5.-1-3=> y= 2

f(3/2) y= -10.5

b y= -8 => -8=-5x-3 => x=-1

y=0 => x= -3/5

Answer 4

y=f(-1)=-5(-1)-3=5-3=2

y=f(3/2)=-5(3/2)-3=-15/2-3=-12

Answer 5

a) f(-1) = -5.(-1) - 3 = 5 - 3 = 2

b) \(f\left(\dfrac{3}{2}\right)=-5.\dfrac{3}{2}-3=-\dfrac{15}{2}-\dfrac{6}{2}=-\dfrac{21}{2}\)

b) *) \(y=-8\Rightarrow-5x-3=-8\)

\(-5x=-8+3\)

\(-5x=-5\)

\(x=1\)

*) \(y=0\Rightarrow-5x-3=0\)

\(-5x=3\)

\(x=-\dfrac{3}{5}\)