Question

Please help asap, 70 points, THREE questions (:

Answer 1

the answer for number 1 is 1.82

Explanation:

Answer 2

`9x^2=17\ \ \ |:9\\\\x^2=(17)/(9)\to x=\pm\sqrt{(17)/(9)}\\\\\boxed{Answer:\ x\approx-1.37\ \vee\ x=1.37}`



`ax^2+bx+c=0\\\\\Delta=b^2-4ac\\\\if\ \Delta > 0\ then\ the\ equation\ has\ 2\ solutions\\if\ \Delta=0\ then\ the\ equation\ has\ 1\ solution\\if\ \Delta < 0\ then\ the\ equation\ has\ no\ solution`


`x^2+5x+7=0\\a=1;\ b=5;\ c=7\\\\Delta=5^2-4\cdot1\cdot7=25-28=-3 < 0\\\\\boxed{Answer:\ 0}`



`5y^2-8y=2\ \ \ |-2\\\\5y^2-8y-2=0\\\\a=5;\ b=-8;\ c=-2\\\\b^2-4ac=(-8)^2-4\cdot5\cdot(-2)=64+40=104\\\\√(b^2-4ac)=√(104)\approx10.198\\\\y_1=(-b-√(b^2-4ac))/(2a);\ y_2=(-b+√(b^2-4ac))/(2a)\\\\y_1=(-(-8)-10.198)/(2\cdot5)\approx-0.22\\\\y_2=(-(-8)+10.198)/(2\cdot5)\approx1.82\\\\\boxed{Answer:\ 1.82,\ -0.22}`