a. 5
b. 10
c. 25
d. 100
2007-03-16 05:06:17 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
x^2 + 10x + k
The value of k required to complete the square is "half squared" of the coefficient of x.
Half of 10 is 5, square is 25.
The answer is 25.
2007-03-16 05:09:59 · answer #1 · answered by Puggy 7 · 0⤊ 0⤋
x^2+10x+k
to find the value of k, take the first part of the equation
x^2+10x
=x^2+2*5*x
Now we know, (a+b)^2= a^2+2ab+b^2
Now if we compare the first part of this equation with the previous equation, we get,
a= 1
b= 5
Therefore, k, or b^2 = 5^2 or 25
Answer is C
2007-03-16 05:16:22 · answer #2 · answered by Bubblez 3 · 0⤊ 0⤋
to complete the square, divide the number multiplied by X, in this case 10, by 2, then square it. so (10/2)^2 = 25.
2007-03-16 05:10:26 · answer #3 · answered by Jeremy S 2 · 1⤊ 0⤋