Question 230967: what would you add to 4x^2-6x to make it a complete squre? a.4/9 b.9/16 c.16/25 d.4/25 e.9/25 Found 2 solutions by stanbon, checkley77:Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! what would you add to 4x^2-6x to make it a complete square?
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If you square ax-b you get:
a^2x^2 - 2abx + b^2
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Your problem:
a^2 = 4, so a = 2.
-2ab = -6, so -2*2*b = -6 ; So b = -6/-4 = 3/2
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You need to add b^2 = 9/4
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None of the answers you listed is correct.
Cheers,
Stan H.
You can put this solution on YOUR website! 4x^2-6x+2.25
(2x-1.5)^2 ans.
Proof:
2x-1.5
2x-1.5 multiply.
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4x^2-3x-3x+2.25
4x^2-6x+2.25
None of these answers=2.25.
9/4=2.25 ??????
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a.4/9
b.9/16
c.16/25
d.4/25
e.9/25
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