x = [4 ± √(16 - 4(1)(-21)]/2
= [4 ± √(16 + 84]/2
= [4 ± √100]/2
= (4 ± 10)/2
= 7,-3
Solve for "x" using the quadratic formula:
X^2-4x-21=0
1 answer
X^2-4x-21=0
1 answer
0 answers
1 answer
1 answer
1 answer