Question

When y = 5, which of the expressions below will be less than 100? Select all that apply. A) y3–3y+8 B) 2y2×32 C) 3(4y–8)+5(2y+2) D) y3–7y

Answer 1

C) & D)

Explanation:

A)

`y^3-3y+8=\\5^3-3*5+8=\\125-15+8=\\110+8=\\118`

B)

`2y^2*32=\\2*5^2*32=\\2*25*32=\\50*32=\\1600`

C)

`3(4y-8)+5(2y+2)=\\3(5-8)+5(2*5+2)=\\-9+5(10+2)=\\-9+5(12)=\\-9+60\\51`

D)

`y^3-7y=\\5^3-7*5=\\125-35=\\90`