Question

Responda por favor ..3 x elevado a 2 menos 9x = 2 x elevado a 2 + 9x - 45

Answer 1

$3 {x}^{2} - 9x = 2 {x}^{2} + 9x - 45$
3x^2-2x^2 -9x- 9x + 45 = 0
x^2-18x+45=0
∆= b^2-4(a)(c)
∆= (-18)^2 - 4(1)(45)
∆= 324 - 180
∆= 144

x'= -b+√∆/2×a
x'= -(-18)+√144/2×1
x'= 18+12/2
x'= 30/2
x'= 15

x"= -b-√∆/2×a
x"= -(-18)-√144/2×1
x"= 18-12/2
x"= 6/2
x"= 3