C, i think you forgot an x
(x+11)+(x-7)
x+11+x-7
x+x+4
2x+4
Answer:
0.08
Step-by-step explanation:
You bring all xs on one side then you solve as quadratic analysis.
so you can simplify into
*Note that here 4 took the negative sign and 1 took the positive sign, as you want to numbers that if multiplied will give -4 and when added will give -3, and these are (-4 and 1)*
so now you can simply say that, for the equation to equal 0, x should be -1 or 4.
You can always substitute to make sure of your calculations.
Hope this helps.