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cansomeone show me how to solve this? Use the quadratic formula to find the zeros of the function. y = 16x2 + 40x + 25
{1.25, 1.25}
{1.25}
{4, 5}
{0.8
 one year ago
 one year ago
cansomeone show me how to solve this? Use the quadratic formula to find the zeros of the function. y = 16x2 + 40x + 25 {1.25, 1.25} {1.25} {4, 5} {0.8
 one year ago
 one year ago

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amistre64Best ResponseYou've already chosen the best response.1
do you recall the setup of the quadratic formula?
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
\[\frac{ b \pm \sqrt{b ^{2}4ac} }{ 2a }\]
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
good, and the general form of a quadratic is: \[ax^2 + bx + c\] pull the numbers from the problem that relate to the abc parts and what do you get worked out?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
good, i notice that there are no  signs to worry about so that looks good so far
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
plug in those numbers into their abc parts in the formula, the rest is just math for maths sake
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
\[x=\frac{ b \pm \sqrt{b ^{2}4ac} }{ 2a }\] \[x=\frac{ 40 \pm \sqrt{40^{2}4(16)(25)} }{ 2(16) }\]
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
\[\frac{ 40\pm \sqrt{40^{2}4(16)(25)} }{ 2(16) }\] is that right?
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
ok then i get 40 pm 1696/32?
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
but i would end up eith a negative number....
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
\[\frac{ 40\pm \sqrt{40^{2}4(16)(25)} }{ 2(16) }\] \[\frac{ 40\pm \sqrt{4^2(10)^24(4^2)(25)} }{ 2(16) }\] \[\frac{ 40\pm 4\sqrt{10^24(25)} }{ 2(16) }\] \[\frac{ 40\pm 4\sqrt{25(4)4(25)} }{ 2(16) }\] \[\frac{ 40}{ 2(16) }\] \[\frac{ 40}{ 2(4.4) }\] \[\frac{ 10}{ 2(4) }\] \[\frac{ 5}{ 4 }\]
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
you lost me at the second one you did how did you get all the the ^2?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
40^2 = (4*10)^2 = 4*10 * 4*10 = 4^2 * 10^2 but you dont have to do exactly what i did
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
uuuuh.....im sorry you lost me all i know is im suppose to square 40 is that what you were doin?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
i was doing some manipulations so that i didnt have to worry about computing large numbers and such; i simplified it down to where i recognized the sqrt part goes to zero.
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
but 40^2  4(16)(25) = 0
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
ui havent learned taht i think im suppose to just use the big numbers
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
then math it out for maths sake, youll get big numbers that finally reduce and simplify
 one year ago

EmmaHBest ResponseYou've already chosen the best response.0
i tried but i keep getting teh wrong number when i have 40^24(16)(5) i get 0 right? i get 1,600 1,600 and i cant square thaty
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
what does 1600  1600 equal?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
sure you can, 0*0 = 0
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
\[\frac{ 40\pm \sqrt{40^{2}4(16)(25)} }{ 2(16) }\] \[\frac{ 40\pm \sqrt{16001600} }{ 2(16) }\] \[\frac{ 40\pm \sqrt{0} }{ 2(16) }\] \[\frac{ 40\pm 0 }{ 2(16) }\] \[\frac{ 40}{ 2(16) }\]
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
yes /32 is fine as well
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
yes, which a calculator should be able to put into decimals for you
 one year ago
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