Renarock
25.09.2020 •
Mathematics
Solve the following quadratic equation:
2x^2+19x+40=-2
A.x=2 or x= -9.5
B.x=-3.5 or x=-6
C.x=-2 or x=-21
D.x=6 or x=7
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Ответ:
-3.5 or -6
Step-by-step explanation:
2x^2+19x+40=-2
2x^2+19x+40+2=0
2x^2+19x+42=0
2x^2+(12+7)x+42=0
2x^2+12x+7x+42=0
2x(x+6)+7(x+6)=0
(x+6)(2x+7)=0
either,
x+6=0
x=-6
or,
2x+7=0
2x=-7
x=-7/2
x=-3.5
Ответ:
Hi!
Assuming the 9in is the radius, we would multiply it by 2, or add it to itself. We then get 18 in.
Hope this helps!