Question

1)resolva as seguintes equaçoes de 2 grau

a) x2-8x+15=0

b)x2-10x+21=0

c)x2+5x-24=0

d)8+x2+6x=0


PRECISO DA RESPOSTA URGENTE

Answer 1

a) x2-8x+15=0

2x-8x+15=0

-6x= -15

x= 5/2

b) x2-10x+21=0

2x-10x+21=0

-8x+21=0

x= 21/8

c) x2+5x-24=0

2x+5x-24=0

7x=24

x=24/7

d) 8+x2+6x=0

8+2x+6x=0

8x= -8

x= -1