Answer:
Option A is correct, i.e. x = -3, x = 7.
Step-by-step explanation:
Given the equation is x² -4x -21 = 0.
We can compare it with general quadratic equation i.e. ax² +bx +c =0.
then a = 1, b = -4, c = -21.
We can use Quadratic formula as follows:-
x = ( -b ± √(b²-4ac) )/2a
x = ( +4 ± √(16-4*1*-21) )/2*1
x = ( +4 ± √(16+84) )/2
x = ( +4 ± √(100) )/2
x = ( +4 ± 10 )/2
x = (4+10)/2 or x = (4-10)/2
x = 14/2 or x = -6/2
x = 7 or x = -3
Hence, option A is correct, i.e. x = -3, x = 7.
The answer to the question is b
Answer:
c=−35
Step-by-step explanation:
Let's solve your equation step-by-step.
−5=
c
7
Step 1: Simplify both sides of the equation.
−5=
1
7
c
Step 2: Flip the equation.
1
7
c=−5
Step 3: Multiply both sides by 7.
7*(
1
7
c)=(7)*(−5)
<span>A = P (1 + r/n)^<span>nt
A = 1000(1 + 0.02/4)^16
A = 1000(1.005)^16
A = 1083.07
answer
$1,083.07 </span></span><span>after the four years</span>
