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alina1380 [7]
3 years ago
5

Factoring trinomials????x^2+8x+15

Mathematics
2 answers:
DiKsa [7]3 years ago
6 0
X^2+8x+15

= x^2 + 5x + 3x + 15

= x(x+5) + 3(x+5)

= (x+5)(x+3)
Scilla [17]3 years ago
4 0

You nee 2 numbers whose sum is +8 and whose product is +15.

That is 3 and 5.

so the answer is (x + 3)(x + 5)

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(1 - cos ß)(1 + cos ß) =1/cosec^2(ß)
iVinArrow [24]

Step-by-step explanation:

L.H.S=(1-cosB)(1+cosB)

=(1-cos^2B). {using (a+b) (a-b)=(a^2-b^2)in second step}

=sin^2B

=1/cosec^2B

Therefore,L.H.S=R.H.S proved

5 0
2 years ago
Using a property of operations, what can you say about the sums of (-13.2) + 8.1 and 13.2 + (-8.1)
Wewaii [24]
They are opposites of each other.
-13.2 + 8.1 = -5.1
13.2 - 8.1 = 5.1
4 0
3 years ago
Chris shoots an arrow up into the air. The height (in feet) of the arrow is given by the function h(t) = - 16t2 + 64t + 112 wher
iris [78.8K]

Answer:

After 2 seconds

Step-by-step explanation:

First step is find an equation of velocity:

h(t)=-16t2+64t+112. The velocity function is derivated from position function, so we should do that.

v(t)= h´(t)= -16*2*t+64 ⇒ v(t)= -32t+64.

Now we know the arrow reach the maximun height when this velocity is equal to zero when t>0.

0=-32t+64 ⇒ 32t=64, split each member for 32 ⇒ \frac{32t}{32}=\frac{64}{32}

t=2. That means after 2 sec. the arrow reach the maximum height

6 0
3 years ago
Read 2 more answers
True or false: for any 2 nonzero integers, the product and quotient have the same sign.
scoray [572]
Yes, it is true.
________________
For example,

take two integers 12 and 4

12 × 4 = 48 : product is positive

12 ÷ 4 = 3: quotient is positive
____________________

If you take -12 and 4

-12 × 4 = -48 : product is negative

-12 ÷ 4 = -3: quotient is negative
4 0
3 years ago
Find the y-intercept<br> - 74 - 7y = -7%
harkovskaia [24]

Answer: -75

Step-by-step explanation:

3 0
2 years ago
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