Question

2x=15-x² (gostaria da conta)

Answer 1

2x=15-x²
x²+2x-15=0
D=(2)²-4.(1).(-15)
D=4+60 = 64
x= -(2) +-8
        2.(1)
x¹=-2+8/2 = 6/2 = 3
x²=-2-8/2 = -10/2 = -5

Answer 2

2x -15 + x² = 0
REORGANIZANDO:
x² + 2x - 15 = 0
a = 1/ b = 2/ c = -15
∆ = b²-4.a.c = 2²- 4. 1 .(-15) = 4 - (-60) = 64
x = -b ± √(b²-4.a.c)/2.a
x = -2 ± √64 / 2. 1
x= -2± 8 /2
x1 = -2 + 8 / 2 = 6/2 = 3
x2 = -2 - 8 / 2 = -10/2 = -5

S = ( -5, 3 )
Abraços.