Question
Solve the quadratic equation
Solve using the quadratic formula
Solve by completing the square
Solve using the PQ formula
x1=63−21,x2=63+21
Alternative Form
x1≈−0.263763,x2≈1.263763
Evaluate
6x2−6x−2=0
Substitute a=6,b=−6 and c=−2 into the quadratic formula x=2a−b±b2−4ac
x=2×66±(−6)2−4×6(−2)
Simplify the expression
x=126±(−6)2−4×6(−2)
Simplify the expression
More Steps

Evaluate
(−6)2−4×6(−2)
Multiply
More Steps

Multiply the terms
4×6(−2)
Rewrite the expression
−4×6×2
Multiply the terms
−48
(−6)2−(−48)
Rewrite the expression
62−(−48)
If a negative sign or a subtraction symbol appears outside parentheses, remove the parentheses and change the sign of every term within the parentheses
62+48
Evaluate the power
36+48
Add the numbers
84
x=126±84
Simplify the radical expression
More Steps

Evaluate
84
Write the expression as a product where the root of one of the factors can be evaluated
4×21
Write the number in exponential form with the base of 2
22×21
The root of a product is equal to the product of the roots of each factor
22×21
Reduce the index of the radical and exponent with 2
221
x=126±221
Separate the equation into 2 possible cases
x=126+221x=126−221
Simplify the expression
More Steps

Evaluate
x=126+221
Divide the terms
More Steps

Evaluate
126+221
Rewrite the expression
122(3+21)
Cancel out the common factor 2
63+21
x=63+21
x=63+21x=126−221
Simplify the expression
More Steps

Evaluate
x=126−221
Divide the terms
More Steps

Evaluate
126−221
Rewrite the expression
122(3−21)
Cancel out the common factor 2
63−21
x=63−21
x=63+21x=63−21
Solution
x1=63−21,x2=63+21
Alternative Form
x1≈−0.263763,x2≈1.263763
Show Solution
