Question

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What number should be added to the expression x2 + 10x to change it into a perfect square trinomial?

A.
5

B.
10

C.
25

D.
100

Answer 1

(x + 5)^2 = x^2 + 10 x + 25

Answer 2

@TylerElizabeth

Answer 3

to complete the square in this situation you would take 10 and divide it by 2 to get 5 then square 5 to get 25. so the equation would be x^2 + 10x + 25. That factors down to (x+5)(x+5) so @thu1935 is correct :)

Answer 4

i dont understand what he said

Answer 5

He did it a different way. When you FOIL (x+5)(x+5) or (x+5)^2 it will equal x^2 + 10x + 25

Answer 6

so C.

Answer 7

yup

Answer 8

thx

Answer 9

no problem