Question

x ao quadrado-7x+10=0

Answer 1

x² = 7x -10

x² -7x +10

Δ= b² -4ac

Δ= (-7)² -4.1.10

Δ= 49 -40

Δ= 9

x= -b +/- √9 / 2a

x= 7 +/- √9 / 2.1

x'= 7 +3 / 2

x'= 10/ 2

x'= 5

x''= 7 -3 / 2

x''= 4 /2

x''= 2

Answer 2

x²-7x+10= 0

a= 1  b= -7   c= 10

Δ= b²-4.a.c

Δ= (-7)²-4.1.10

Δ= 49-40

Δ= 9

x= -b+-√Δ/2.a

x= (-b+-√9)/2.1

x= (-(-7)+-3)/2

x= (7+-3)/2

x¹= (7-3)/2  ⇒ x¹= 4/2 ⇒ x¹= 2

x²= (7+3)/2 ⇒ x²= 10/2 ⇒ x²= 5

Resposta → S= {2, 5}