Use the distributive property to expand the expression. 5x2 − (6x − 4y) + 9z

5x² − 6x + 4y + 9 z

Step-by-step explanation:

5x^2 −1(6x − 4y) + 9z

You see the -1 in front of (6x-4y) that is actually there, it is just disguised as a - sign. When you take away the ()'s you must distribute this negative one to 6x and -4y.

-1 * 6x = -6x

-1 * -4y = 4y

so now we have 5x² - 6x + 4y + 9z*

*the + in front of 9z need not  be changed we are only changing the stuff inside the ()'s

35x 3= 105

step-by-step explanation:

35+35= 70   70 + 35= 105

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,