Activity 1.5 The Secret FORMULA! a. Find the value of a, b and c in the following quadratic equations.
Quadratic Equation a b c
1. x2 − 4x− 5 = 0
2. 2x2 + x− 6 = 0
3. x2 − 3x = −1
4. x2 − 6x = −2x + 7
5. −2x = −3x2 + 8

b. Using the given quadratic equations above, find the roots using quadratic formula. Simplify your
answer.

i believe a. 12x≥120 is the answer

the exponential expression to find the value of the cd, in dollars, after t years will be:  

step-by-step explanation:

formula of compound interest:   , where final value after years,   initial value, rate of interest in decimal and number of compounding in a year.

oliver plans to purchase a $1,500 certificate of deposit (cd) at his bank. that means,  

the cd will earn 2.3% interest, compounded semi-annually.

so,   and  

now, plugging these values into the above formula, we will

(rounded to the nearest ten-thousandth)

so, the exponential expression to find the value of the cd, in dollars, after t years will be: