За-4 = -13
Find the value of the variable

the answer is a= -3

Step-by-step explanation:

3a-4=-13

add 4 on both sides of the equal sign

3a=-9

dividide by 3 on both sides of the equal sign

a=-3

Quadratic function (8.1)

nonlinear function that can be written in the standard form y=ax²+bx+c

where a ≠ 0

Step-by-step explanation:

Find the x-intercept(s). To find the x-intercept let y = 0 and solve for x. You can solve for x by using the square root principle or the quadratic formula (if you simplify the problem into the correct form).