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irinina [24]
4 years ago
12

If the quadratic equation x2+18x+74=0 is rewritten in the form (x−p)2=q, what is the value of q?

Mathematics
1 answer:
PilotLPTM [1.2K]4 years ago
3 0

Answer:

<em>C) 7</em>

Step-by-step explanation:

<u>Quadratic equation</u>

The quadratic equation can be written in several ways, one of the most-used is

ax^2+bx+c=0

To rewrite the equation in the form

(x-p)^2=q

we can complete squares and rearrange the terms as follows. The provided equation is

x^2+18x+74=0

The second term can be seen as

2(x)(9)

And the first two terms can be visualized as the square of a binomial

x^2+2(x)(9)+81-81+74=0

We have added and subtracted 81 to complete the square and not modify the equation. The new form of the equation is

(x+9)^2-7=0

Rearranging

(x+9)^2=7

Comparing with the general form written above, we find that

\boxed{q=7}

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