Question

como calculo x elevado a dois + 51 =20x ?

Answer 1

x^2 + 51 = 20x
x^2 - 20x + 51 = 0
D = 400 - 204 = 196
x = 20 + -14 / 2
x1 = 34 / 2 = 17
x2 = 6 / 2 = 3

Answer 2

Resolve por bhaskara
x² + 51 = 20x
x² + 51 - 20x = 0

X = - b± √b²-4.a.c / 2a
X = -(-20) ± √(-20)² - 4.a.51
x = 20 ± √400 - 204 /2
X = 20 ± √ 196 /2
X = 20 ± 14 /2

x¹ = 20 - 14 /2
x¹ = 6/2
x¹ = 3

x² = 20 + 14 /2
x² = 34/2
x² = 17