Question

me ajudeem, por favor! É urgente

Answer 1

a)-x²+5x+6=0

x²-5x-6=0

x²+x-6x-6=0

x(x+1)-6(x+1)=0

(x+1).(x+6)=0

x+1=0

x-6=0

x¹=-1

x²=6

b)x²-10x+16=0

x²-2x-8x+16=0

x(x-2)-8(x-2)=0

(x-2)(x-8)=0

x-2=0

x-8=0

x¹=2

x²=8

c)-x²+7x+30=0

x²-7x-30=0

x²+3x-10x-30=0

x(x+3)(x+10)=0

x+3=0

x-10=0

x¹=-3

x²=10