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Δ = 4² -4 *1 * (-21)
Δ = 16 + 84
Δ = 100
x' = (-b + √∆)/ 2a
(-4 + 10)/2 * 1
(-4 + 10)/2
6/2
3
x'' = (-b - √∆)/ 2a
(-4 - 10)/2 * 1
(-4 - 10)/2
-14/2
-7
S={-7,3}
∆=b²-4ac=
(-4)²-4(1)(-21)=
16+84=100, √100=10
x=-b±√∆/2a
x=(4±10)/2
x'=14/2=7
x"=-6/2=-3
(-3,7)