Question

x ao quadrado = 7X- 12

Answer 1

x²=7x-12
x²-7x+12=0
Δ= b²- 4ac
Δ=(-7)²-4*1*12
Δ=49-48
Δ=1
x'= 7+1/2 = 8/2= 4
x''=7-'/2=6/2=3
x'= 4
x''=3