Answer:
3
Step-by-step explanation:
f(x)=3x² + x-7
if f(-2)
3(-2)²+-2-7
--> 3
Answer:
(2, -9)
Step-by-step explanation:
2 - (-9) > 8 First, substitute the values for x and y.
2 + 9 > 8
11 > 8 The inequality is true, so (2, -9) is the correct pair.
Answer:
So, the coefficient of x8 in the given expansion will be 210.
Step-by-step explanation:
We know,
General term in (x+a)n is given by,
Tr+1=C(n,r)xn−rar
∴ General term in (x2−1x)10 ,
Tr+1=C(10,r)(x2)10−r(−1x)r
⇒Tr+1=(−1)rC(10,r)x20−2rx−r
Now, we have to find the term having coefficient x8.
∴20−2r−r=8⇒r=4
So, T5 will have coefficient x8.
∴T5=(−1)4C(10,4)x8
⇒T5=10⋅9⋅8⋅74⋅3⋅2⋅1x8
⇒T5=210x8
Answer:
(x+1)(x-5)
Step-by-step explanation:
(x+a)(x+b)=x²-4x-5
then a+b=-4 and a*b=-5
so a=-1 and b=5
