How to show your work to solve 3r^2-16r-7=5

Answers

Answer 1

Answer: OK so 3r^2-16r-7=5
Subtract five from both sides
3r^2-16r-7-5=0
Add like terms
3r^2-16r-12=0
Factorise it, this means putting it into brackets
(3r + 2)(r - 6)
Find out what multiplies to make negative twelve but adds to make negative sixteen
However none of the terms do this so we put negatives next to the "r"s
(-3r + 2)(-1r - 6)
The answer is r=6

Answer 2

Answer:

Answer:

Step 1: Subtract 5 from both sides.

3r2−16r−7−5=5−5

3r2−16r−12=0

Step 2: Factor left side of equation.

(3r+2)(r−6)=0

Step 3: Set factors equal to 0.

3r+2=0 or r−6=0

r=−2/3

or r=6

Answer:

r=−2/3

or r=6

Step-by-step explanation:

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Simplify the expression. -14 x 8 x 1/4 + (-22) a. –50
b. –138
c. –470
d. –6

Answers

-14 x 8 x 1/4 + (-22)

Apply BODMAS

Open the brackets:
-14 x 8 x 1/4 + (-22) = -14 x 8 x 1/4 -22

Division
-14 x 8 x (1/4) - 22 = -14 x 8 x 0.25 - 22

Multiplication
(-14 x 8 x 0.25 )- 22 = -28 - 22

Subtraction
-28-22 = -50

Correct answer: A <-50>

If 3 1/2 pounds of bananas cost 1.96 how much would one pound cost

Answers

It would cost 56 cents.

Answer:

56 cent

Step-by-step explanation:

divide 1.96 by 3.5

Question 2: SQUARE ROOTS

Answers

Answer:

A) 15 and 16

Step-by-step explanation:

The square root of 250 is 15.8, so it falls between:

15 and 16

One book costs one pound ninety five pence. How much does six books cost

Answers

All you have to do is times 195 by 6:

195

x 6

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

1 1 7 0

Now make that back into £11.70

1.95*6=11.70 the answer is 11 pounds 70 pence

Three of the angles of a quadrilateral are 53°, 127° and 72°. What is the size of the 4th angle?

Answers

The size of the fourth angel = 360 - ( 53 + 127 + 72 ) = 108

a bicycle is on sale at $12 more than half of a regular price. If the sale price is $ 75, find the regular price

Answers

75-12=63 x 2=126<------------- answer

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