Expression 3x²+4x-5
x=-2​

15

Step-by-step explanation:

I'm assuming that you want me to express x as -2.

3(-2)^2+4(2)-5

3*4+8-5

12+8-5

15

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.