X- 3 = 4 solve this algebraic expression

x=-7

Step-by-step explanation:

- x - 3 = 4

Add 3 to each side

- x - 3 +3= 4+3

-x = 7

Multiply by -1

-1*-x = 7*-1

x =-7

(-1,0) and (4,0) are x-intercepts.

step-by-step explanation:

x-intercepts are all points on the x-axis.

points (-1,0) and (4,0) are both x -intercepts.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.