Question
Solve the equation
Solve for q
q1=21−5,q2=0,q3=21+5
Alternative Form
q1≈−0.618034,q2=0,q3≈1.618034
Evaluate
q3−q×1=q2
Any expression multiplied by 1 remains the same
q3−q=q2
Move the expression to the left side
q3−q−q2=0
Factor the expression
q(q2−1−q)=0
Separate the equation into 2 possible cases
q=0q2−1−q=0
Solve the equation
More Steps

Evaluate
q2−1−q=0
Rewrite in standard form
q2−q−1=0
Substitute a=1,b=−1 and c=−1 into the quadratic formula q=2a−b±b2−4ac
q=21±(−1)2−4(−1)
Simplify the expression
More Steps

Evaluate
(−1)2−4(−1)
Evaluate the power
1−4(−1)
Simplify
1−(−4)
If a negative sign or a subtraction symbol appears outside parentheses, remove the parentheses and change the sign of every term within the parentheses
1+4
Add the numbers
5
q=21±5
Separate the equation into 2 possible cases
q=21+5q=21−5
q=0q=21+5q=21−5
Solution
q1=21−5,q2=0,q3=21+5
Alternative Form
q1≈−0.618034,q2=0,q3≈1.618034
Show Solution