What’s the answer? and how do I do this ?

Choice C (x+2)(x+5)

Step-by-step explanation:

Choice A: 5x-2x = 3x, not right.

Choice B: 10x+7x = 17x, not right.

Choice C: 5x+2x = 7x, right.

So the answer is choice C, the clever wouldn't waste time on calculation when you know the right answer.

But if you want to know...

Choice A: Fortunately, the coefficient for x^2 is 1 which is easy to factor

Now we see -2 and 5, you don't need to calculate, just calculate -2+5 = 3 or if you want.

[5(x)]+[-2(x)] = 5x-2x = 3x

For +10, just multiply 5 and -2 then you get -10

Choice B: Same with choice one, you can find the middle expression by,

7x+10x = 17x or in advanced way

10(x)+7(x) = 10x+7x = 17x

For the last expression, jut multiply 10 and 7, you get 70 which is not even right.

Choice C is right because 5x+2x = 7x (From 5(x)+2(x)=5x+2x=7x)

Then multiply 2 and 5 to get last expression aka 10 as you get 10

i think it is 70

step-by-step explanation:

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d