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xboxgamer304
25.10.2019 •
Mathematics
1. factor the expression 3x3 +4x2 -15x -20. show your work for full credit.
2.solve the equation p2 + 4p = -6 by completing the square.
show all your work. hint: find c by ( ½ b)2, then use the method in lesson 3.08
complete the square page 2. go through the example.
3. explain the steps on how you would factor the expression 25x2 + 9y2
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Ответ:
answer:
1. answer is (x^2 - 5) • (3x + 4)
step 1: • (x^3)) + 22x^2) - 15x) - 20
step 2: ((3x^3 + 22x^2) - 15x) - 20
thoughtfully split the expression at hand into groups, each group having two terms :
group 1: -15x-20
group 2: 3x3+4x2
pull out from each group separately :
group 1: (3x+4) • (-5)
group 2: (3x+4) • (x2)
add up the two groups : (3x+4) • (x^2-5)
2. answer is -2 -√ 2 • i or -2 + √ 2 • i
take the coefficient of p , which is 4 , divide by two, giving 2 , and finally square it giving 4
add 4 to both sides of the equation :
on the right hand side we have :
-6 + 4 or, (-6/1)+(4/1)
the common denominator of the two fractions is 1 adding (-6/1)+(4/1) gives -2/1
so adding to both sides we finally get :
p2+4p+4 = -2
adding 4 has completed the left hand side into a perfect square :
p2+4p+4 =
(p+2) • (p+2) =
(p+2)^2
things which are equal to the same thing are also equal to one another. since
p2+4p+4 = -2 and
p2+4p+4 = (p+2)^2
then, according to the law of transitivity,
(p+2)^2 = -2
we'll refer to this equation as eq. #2.2.1
note that the square root of
(p+2)^2 is
(p+2)2/2 =
(p+2)1 =
p+2
now, applying the square root principle to eq. #2.2.1 we get:
p+2 = √ -2
subtract 2 from both sides to obtain:
p = -2 + √ -2
since a square root has two values, one positive and the other negative
p2 + 4p + 6 = 0
has two solutions:
p = -2 + √ 2 • i
or
p = -2 - √ 2 • i
answer is 25x^2 + 9y^2 because the expression is not factorable with rational numbers.
step 1: (25 • (x^2)) + 32y^2
step 2: 52x^2 + 32y^2
Ответ:
24 units^2
Step-by-step explanation: