F(x) = 4x - 7
g(x) = 2x + 4
f(x) + g(x) = 4x - 7 + 2x + 4 = 6x - 3
(f + g)(-3) = 6(-3) - 3 = -18 - 3 = -21.
The simplified expression is 5x to the 7 power times 56 to the power of 8
Hello,
I)
1 solution with multiplicity 2
(2x+1)²=0
II) ANSWER C (-4.41, -1.59)
-3-√2 and -3+√2
III)
y=x²+2x
y=3x+20
==>x²+2x=3x+20
==>x²-x-20=
Δ=1+4*20=81=9²
(x=(1-9)/2=-4 and y= 3*(-4)+20=8 ) or (x=(1+9)/2=5 and y=3*5+20=35)
They will be 400 miles apart in 4 hours.