a. What number should be added to x²+6x to get (x+3)²?
b. If 21²=400+40+k,find k
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Answer:
1) If you add 9 (the square of one-half of the coefficient of the linear term) you would get a perfect square:
you add 9 (the square of one-half of the coefficient of the linear term) you would get a perfect square:x^2 + 6x + (6/2)^{2} = x^2 + 6x +9 = (x+3)^2
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hope it helps you
kimtaehyung83:
okay but fast
ok
a) (x+1/2 )²=x²+2 x 1/2+--------
b.Find (5 1/2)² using the above methods
how many more you're giving?
In second one you missed a symbol,please rewrite the question
a or b
b. Find ( 5 1/2)² using the above methods
it's (5× 1/2)^2?
in first one why you gave that dot?
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