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svp [43]
3 years ago
11

Find k so that 25x^2 + 40x + k is the square of the binomial.

Mathematics
2 answers:
Veseljchak [2.6K]3 years ago
6 0

Answer:

The value of k is, 16

Step-by-step explanation:

Using the square of the binomial.

(a+b)^2 = a^2+2ab+b^2            .....[1]

Given the polynomial

25x^2+40x+k

On comparing with [1] we have;

a^2 = 25x^2

2ab = 40x and

b^2 = k

then;

a=\sqrt{25x^2} = 5x

Solve for b:

2ab =40x

2 \cdot 5x \cdot b =40x

⇒10xb = 40x

Divide both sides by 10x we have;

b = 4

it is given that:

k = b^2 = 4^2 = 16

then,

we get the square of the binomial;

(5x+4)^2 = 25x^2+40x+16

Therefore, the value of k is, 16

allochka39001 [22]3 years ago
3 0
K= 16

25x^2+40x+16x comes to be (5x+4)^2.
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