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3 years ago

What are the square roots of the equation x^2 + 6x - 9 = 0? PLEASE HELP!!!

1 answer:

3 0

X^2+ 6x - 9 = 0

Use the quadratic formula
x = (−b± sqrt (b^2−4ac)) / 2a

a = 1
b = 6
c = -9

x = −6± sqrt (6^2−4(1)(-9) / 2(1)
x = (−6± sqrt(72))/2

so these are your two solutions to the equation
x = 1.243
x = -7.243

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−3(2+4k)+7(2k−1) eqivalent expression

Alex17521 [72]

Answer:

$\large\boxed{-3(2+4k)+7(2k-1)=2k-13}$

Step-by-step explanation:

$-3(2+4k)+7(2k-1)\qquad\text{use the distributive property}\ a(b+c)=ab+ac\\\\=(-3)(2)+(-3)(4k)+(7)(2k)+(7)(-1)\\\\=-6-12k+14k-7\qquad\text{combine like terms}\\\\=(-12k+14k)+(-6-7)\\\\=2k-13$

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3 years ago

15. A rectangle has a length of 2x - 1 and a width of 3x + 7. Find the perimeter of this rectangle.

andrew11 [14]

Answer:

10x + 12 and 6x² + 11x - 7

Step-by-step explanation:

The perimeter (P) of a rectangle is calculated as

P = 2l + 2w ( l is length and w is width )

= 2(2x - 1) + 2(3x + 7) ← distribute parenthesis

= 4x - 2 + 6x + 14 ← collect like terms

= 10x + 12

--------------------------------------------------

The area (A) of a rectangle is calculated as

A = lw

= (2x - 1)(3x + 7) ← expand using FOIL

= 6x² + 14x - 3x - 7 ← collect like terms

= 6x² + 11x - 7

7 0

2 years ago

What does 3 (2x - 4) = 8x 14 equal?

jeka57 [31]

6x - 12 = 8x + 14
2x = - 26
x = - 13

5 0

3 years ago

A customer at a Mexican restaurant placed a order for burrito bowls that cost $5 each and a plate of corn tocos that cost $13. H

Lubov Fominskaja [6]

Answer:

the customer bought 2 burrito bowls and 1 corn taco.

Step-by-step explanation:

13+5=23

23+5=23

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3 years ago

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My name is Ann [436]

Answer:C

Step-by-step explanation:

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2 years ago