Mathematics: Use the quadratic formula to solve 2y2 – 5y = –2.

Use the quadratic formula to solve 2y2 – 5y = –2.

Ответ:

jor66

31.12.2021

$2y^2-5y=-2\ \ \ /+2\\\\2y^2-5y+2=0\\\\a=2;\ b=-5;\ c=2\\\\\Delta=b^2-4ac\\\\\Delta=(-5)^2-4\cdot2\cdot2=25-16=9\\\\y_1=\frac{-b-\sqrt\Delta}{2a};\ y_2=\frac{-b+\sqrt\Delta}{2a}\\\\\sqrt\Delta=\sqrt9=3\\\\y_1=\frac{5-3}{2\cdot2}=\frac{2}{4}=\frac{1}{2};\ y_2=\frac{5+3}{2\cdot2}=\frac{8}{4}=2$

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Ответ:

kritalewis

18.08.2022

Mathematics

Alright so let’s find the area of the whole wall first including the door

18x12=216 sq ft

Then we find the area of the door 7x3= 21

Then subtract that from the area of the whole wall 216-21= 195 sqft

Only 1 gallon of paint will be needed since 195 is less then 200!!

Hope this helps! :)

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Use the quadratic formula to solve 2y2 – 5y = –2.

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