Which are the solutions of x2 = –7x – 8?

2 answers:

4 0

Add 7x+8 to both sides
x^2+7x+8=0
use quadracit formula
x= $\frac{-b+/- \sqrt{b^2-4ac} }{2a}$
a=1
b=7
c=8

x= $\frac{-7+/- \sqrt{7^2-4(1)(8)} }{2(1)}$
x= $\frac{-7+/- \sqrt{49-32} }{2}$
x= $\frac{-7+/- \sqrt{17} }{2}$
aprox
x=-5.56155 or -1.438

Yuri [45]3 years ago

4 0

Answer:

the answer is C

Step-by-step explanation:

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11. Maria's age is 3 years more than twice George's age. Which expression represents George's age in terms of Maria's?

leonid [27]

Answer:

Step-by-step explanation:

Okay, the catch of this question is that they do a very good job of explaining Maria's age in terms of George's age, but they leave George's age in terms of Maria's all up to you.

First start off by doing an expression of what they explicitly give you. Maria's age in terms of George's age.

Let's use variables g, representing George's age and m representing Maria's age

m = 2g + 3

Okay, this is all dandy and all, but they ask us for George's age in terms of Maria's, so we need to isolate for g.

subtract the 3 from both sides, like so:

m - 3 = 2g

then divide 2 from both sides: (remember we're dividing the whole thing)

(m-3)/2 = g

Now we have an expression for George's age in terms of Maria's.

g = (m-3)/2 or $g = \frac{m-3}{2}$