3 years ago

What number must be added to the expression below to complete the square? x^2-9x

Mathematics

2 answers:

Tatiana [17]3 years ago

5 0

Answer:

A.81/4

Step-by-step explanation:

To find the number that we add to complete the square, we take half of the value of b in the equation and then square it.

The value of b in this equation is -9; this makes half of it -9/2. Squaring this,

(-9/2)² = 81/4.

pantera1 [17]3 years ago

3 0

Answer:

A.81/4

Step-by-step explanation:

x^2-9x

This is in the form x^2 + bx

To complete the square, we take b/2 then square it and add it

b =-9

b/2 = -9/2

(b/2) ^2 = (-9/2) ^2 = 81/4

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