Simplify 3x + 6x 2 - 5x - x 2.

6x 2 + 2x
6x 2 - 2x
5x 2 - 2x
5x 2 + 2x

Question

Simplify 3x + 6x 2 - 5x - x 2.

6x 2 + 2x
6x 2 - 2x
5x 2 - 2x
5x 2 + 2x

marigirl · Answer

can u clarify $$3x+6x ^{2}-5x-x ^{2}$$

anonymous · Answer

ya @marigirl

marigirl · Answer

ok would u be able to tell me in that expression, which terms have the same variable... i.e. which terms have the 'same looking' x

anonymous · Answer

?

marigirl · Answer

let me write in this way. i just moved the -5x

$$3x-5x+6x ^{2}-x ^{2}$$

can u see that 3x and -5x both have 1 x

where as the next two have $$x ^{2}$$

marigirl · Answer

what this means is that we can only add or minus numbers with x's that Look the same....

that means we can go 3x-5x to get an answer which is -2x.... are u with me?

then we can go $$6x ^{2}-x^2$$ to get $$5x ^{2}$$

marigirl · Answer

what we did now is collect like variables, i,e add or subtract terms in which the x looks the SAME.. so ur final ans is $$5x ^{2}-2x$$