Question

Resolva as equações?
×2+8×+15=0

Answer 1

$x^{2} + 8x + 15 = 0 \\ \\ a = 1, b = 8, c = 15 \\ \\ \Delta = b^2 - 4 * a * c \\ \Delta = 8^2 - 4 * 1 * 15 \\ \Delta = 64 - 60 = 4 \\ \\ x = \frac{-b\pm \sqrt{\Delta} }{2*a} \\ \\ x = \frac{-8\pm \sqrt{4} }{2*1} \\ \\ x = \frac{-8\pm2}{2} \\ \\ x' = \frac{-8+2}{2} = \frac{-6}{2} = -3 \\ \\ x'' = \frac{-8 - 2}{2} = \frac{-10}{2} = -5$

Answer 2

x2+8x+15=0
a=2 b=8 c=15
∆=b²-4ac
∆=(2)²-4.2.8.15
∆=4-960
∆=-964

x=b±√∆
—————
2a

x=2±√964
——————
2.1

x'=-2+64=62=31
—————
2.2
x=-2-64=-66=-33
———— ——
2. 2
solução

{ 31;-33}