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5.In the following equation, identify the xintercepts in the graph y = 3x^2 + 19x – 40.
I'm stuck on this problem can anyone help? :)
 one year ago
 one year ago
5.In the following equation, identify the xintercepts in the graph y = 3x^2 + 19x – 40. I'm stuck on this problem can anyone help? :)
 one year ago
 one year ago

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mathsloverBest ResponseYou've already chosen the best response.3
You mean to say that we have to find x intercept?
 one year ago

waterineyesBest ResponseYou've already chosen the best response.1
Where are you having problem??
 one year ago

mathsloverBest ResponseYou've already chosen the best response.3
Ok so just put y =0 : \[\large{0=3x^2+19x40}\] \[\large{0=3x^2+24x5x40}\] \[\large{0=3x(x+8)5(x+8)}\] \[\large{0=(3x5)(x+8)}\]
 one year ago

waterineyesBest ResponseYou've already chosen the best response.1
For finding x intercept we put y = 0..
 one year ago

LoujoelouBest ResponseYou've already chosen the best response.0
Oh okay, sry I forgot about that and yeah had trouble factoring it and now I see. This means our x= 8 and 5/3
 one year ago

mathsloverBest ResponseYou've already chosen the best response.3
3x5=0 x+8=0 3x=5 x=8 x=5/3
 one year ago

rymdenbarnBest ResponseYou've already chosen the best response.0
Right, I'd also like to add that in case you forget whether to make the y or the x zero when it comes to either intercept remember that any xintercept would have to be (x, 0) and that any yintercept would have to be (0, y). Cheers
 one year ago
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