Quadratic Formula
x2+4x−5=0
x=1,−5
x2+5x+6
(x+2)(x+3)
A population starts at 200 and grows by 5% each year.
Write the exponential function.
y=200(1.05)x
(8x+4)(X-3)
4(2x+1)(x−3)
2x2+3x−2=0
x=1/2,−2
x2−9
(x−3)(x+3)
A car is worth $15,000 and decreases by 12% each year.
Write the exponential function.
Answer
y=15000(0.88)x
2(x2+5x+6)
2(x+2)(x+3)
3x2+7x−6=0
x=2/3, -3
2x2+7x+3
(2x+1)(x+3)
A savings account starts with $800 and grows by 7% annually.
How much money will be in the account after 3 years?
y=800(1.07)3
y=980.03
4x2+24x+20
4(x+1)(x+5)
4x2−81=0
x=+/- 4.5
3x2−27
3(x−3)(x+3)
A gym membership starts with 450 members and increases by 18% each year.
Write the exponential function and find the number of members after 4 years.
y=450(1.18)4
y≈872
6x2−54
6(x−3)(x+3)
−3x−5=-7x2
x≈1.086, −0.657
6x2−7x−3
(3x+1)(2x−3)
A town population starts at 25,000 and decreases by 4.5% each year.
What will the population be after 10 years? Round to the nearest whole number.
y=25000(0.955)10
y≈15772
8x2−28x−24
4(2x+1)(x−3)