(x+1)(x-5)= 2^4=16

x^2 -4x -5 =16

x^2-4x-21=0

x= -3 or 7
but we would choose 7 as the answer as -3 gives negative value at (x+1) and we know that log of negative number is not defined.

6 0

3 years ago

you spend at most $10 at the mall you want to buy a book that costs $6.75 and a cold drink how much can you spend on the drink?

Aneli [31]

You can make an equation: 6.75 + x = 10
6.75 is the amount you spend on the book, x is the amount you can spend on the drink, and 10 is the total cost.

Solve for x to find how much you can spend on the drink.
6.75 + x = 10
Subtract 6.75 from both sides to isolate x.

x = 3.25

You can spend $3.25 on the drink.

6 0

3 years ago

17.

Hitman42 [59]

<h3>Solution:</h3>

Using formula (a-b)^2 = a^2-2ab+b^2

$4x^{2} - 12x + k \\ = > (2x) ^{2} - 2(2x)(3) + {3}^{2} \\ \\ = > {(2x)}^{2} - 2(2x)(3) + 9$

<h3>Answer:</h3>

k = 9

8 0

3 years ago

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