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Given the following perfect square trinomial, fill in the missing term. (Do not type the variable in the blank.)
4x2 + ___x + 49
 one year ago
 one year ago
Given the following perfect square trinomial, fill in the missing term. (Do not type the variable in the blank.) 4x2 + ___x + 49
 one year ago
 one year ago

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cwrw238Best ResponseYou've already chosen the best response.0
the two square roots involved are 2 and 7 so arithmetic on these will give you the missing number
 one year ago

amistre64Best ResponseYou've already chosen the best response.2
well, our options for this would suggest that: (2x)^2 + nx + (7)^2 comes form either: (2x+7)^2 or (2x7)^2 ; the + on the middle term would indicate the first
 one year ago

SavvyBest ResponseYou've already chosen the best response.0
since 49 is apart of the square a term must be its square root i.e. 7 and sincce the other square term is 4x^2...then the term before squaring must be its square root i.e. 2x... so (2x + 7)^2 = 4x^2 + 28x + 49
 one year ago

ZhangYanBest ResponseYou've already chosen the best response.3
The answer would be 4x^2+ 14x+49 You take the square root of 49 and then take that answer (which is 7) and multiply it by 2. Hope this helps!
 one year ago

amistre64Best ResponseYou've already chosen the best response.2
Zhang, that only works if the first term is an x^2; we got a 4 in the way this time to do that we would have to divide off the 4 and work it out
 one year ago

amistre64Best ResponseYou've already chosen the best response.2
but, i spose the wrong answer is the best answer :) lol
 one year ago

amistre64Best ResponseYou've already chosen the best response.2
(2x+7)^2 = 4x^2 +28x + 49
 one year ago

ZhangYanBest ResponseYou've already chosen the best response.3
@amistre64 is my answer is wrong??
 one year ago

amistre64Best ResponseYou've already chosen the best response.2
you should be able to dbl chk it to determine that, but as is, your answer is wrong. You did not account for the 4 on the first term
 one year ago

ZhangYanBest ResponseYou've already chosen the best response.3
oh right lol sorry it was 28
 one year ago

amistre64Best ResponseYou've already chosen the best response.2
(ax+b)^2 = (ax)^2 + 2ab x + b^2 sqrt(b^2) * 2 = 2b but that only works if a=1, otherwise we have to adjust it for a
 one year ago
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