Question

Determine as raizes das equações abaixo

Answer 1

$A)\\x^{2}-7x+6=0\\\\DELTA=(-7)^{2}-4.1.6\\DELTA=49-24\\Delta=\sqrt{25} \\\\x^{1}=\frac{7+5}{2} \\x^{1}=\frac{12}{2} =6\\\\x^{2}=\frac{7-5}{2} = \frac{2}{2}=1\\\\\\B)x^{2}-8x+15=0\\DELTA=(-8)^{2}-4.1.15\\DELTA=64-60\\DELTA=4\\\\x^{1}=\frac{8+2}{2} =\frac{10}{2} =5\\\\x^2=\frac{8-2}{2}=\frac{6}{2}=3 \\\\\\C)x^2+10x+25=0\\\\DELTA=10^2-4.1.25\\DELTA=100-100\\DELTA=0\\\\x^1=\frac{-10-0}{2} =-5\\x^2=\frac{-10+0}{2} =-5$